NSC PPT 463.pdf
•
0 likes•5 views
Conventional encryption uses a single key that is shared between the sender and receiver to both encrypt and decrypt messages. The sender uses the key to encrypt the plaintext message into ciphertext, and the receiver uses the same key to decrypt the ciphertext back into plaintext. While simple and fast, conventional encryption has disadvantages in that it cannot guarantee the origin or authenticity of messages, is less secure than public key encryption, and does not scale well for large numbers of users as each pair of users must agree upon a shared key.
Report
Share
Report
Share
Download to read offline
Recommended
A Survey on Cryptographic Techniques for Network Security.pdf
This document summarizes and compares several cryptographic techniques for network security, including AES, 3DES, Blowfish, and DES. It provides an overview of each algorithm, including key sizes and block sizes. AES is identified as providing better performance and security compared to other algorithms like 3DES and DES. The document also reviews related literature on encrypting data for network security and enhancing encryption methods. It concludes that AES is a better encryption algorithm than alternatives like 3DES and DES due to its performance and security against attacks like brute force.
Lesson 04 - Symmetric and Asymmetric Key Encryptions (1).pptx
1. Symmetric key cryptography uses a single secret key for both encryption and decryption, while asymmetric key cryptography uses two different but mathematically related keys, a public key and a private key.
2. In asymmetric encryption, the public key is used to encrypt messages and its companion private key is used to decrypt messages. Only the recipient who possesses the private key can decrypt messages encrypted with their public key.
3. The essential steps of asymmetric encryption are that each user generates a public-private key pair, places their public key in a register for others, and encrypts messages sent to recipients with their public key which can only be decrypted with the corresponding private key.
Cryptography.pptx
The seminar covered cryptography, including its definition as using Greek words for "hidden" and "writing" to securely transmit information. Cryptography provides confidentiality, integrity, and availability via techniques like encryption, decryption using keys, hashing and symmetric/asymmetric algorithms. Symmetric cryptography uses a single shared key for encryption and decryption while asymmetric uses public/private key pairs. Hashing transforms data to a fixed-length code for integrity checks.
httpswww.youtube.comwatchtime_continue=8&v=rFV0aes0vYAN.docx
https://www.youtube.com/watch?time_continue=8&v=rFV0aes0vYA
Network Security Essentials: Applications and Standards
Sixth Edition
Chapter 2
Symmetric Encryption and
Message Confidentiality
Copyright © 2017 Pearson Education, Inc. All Rights Reserved
If this PowerPoint presentation contains mathematical equations, you may need to check that your computer has the following installed:
1) MathType Plugin
2) Math Player (free versions available)
3) NVDA Reader (free versions available)
This chapter provides a general overview of the subject matter that structures the material in the remainder of the book. We begin with a general discussion of network security services and mechanisms and of the types of attacks they are designed for. Then we develop a general overall model within which the security services and mechanisms can be viewed.
1
Figure 2-1: Simplified Model of Symmetric Encryption
Copyright © 2017 Pearson Education, Inc. All Rights Reserved
A symmetric encryption scheme has five ingredients (Figure 2.1):
• Plaintext: This is the original message or data that is fed into the algorithm
as input.
• Encryption algorithm: The encryption algorithm performs various substitutions
and transformations on the plaintext.
• Secret key: The secret key is also input to the algorithm. The exact substitutions
and transformations performed by the algorithm depend on the key.
• Ciphertext: This is the scrambled message produced as output. It depends on
the plaintext and the secret key. For a given message, two different keys will
produce two different ciphertexts.
• Decryption algorithm: This is essentially the encryption algorithm run in
reverse. It takes the ciphertext and the same secret key and produces the
original plaintext.
2
Requirements (1 of 2)
There are two requirements for secure use of symmetric encryption:
A strong encryption algorithm
Sender and receiver must have obtained copies of the secret key in a secure fashion and must keep the key secure
The security of symmetric encryption depends on the secrecy of the key, not the secrecy of the algorithm
This makes it feasible for widespread use
Copyright © 2017 Pearson Education, Inc. All Rights Reserved
There are two requirements for secure use of symmetric encryption:
1. We need a strong encryption algorithm. At a minimum, we would like the
algorithm to be such that an opponent who knows the algorithm and has
access to one or more ciphertexts would be unable to decipher the ciphertext
or figure out the key. This requirement is usually stated in a stronger form:
The opponent should be unable to decrypt ciphertext or discover the key even
if he or she is in possession of a number of ciphertexts together with the plaintext
that produced each ciphertext.
2. Sender and receiver must have obtained copies of the secret key in a secure
fashion and must keep the key secure. If someone can discover the key and
knows the algorithm, all communication using this key is reada ...
asymmetric encryption.pptx
Asymmetric encryption, also known as public-key cryptography, is a cryptographic system that uses a pair of keys for secure communication. Unlike symmetric encryption, where the same key is used for both encryption and decryption, asymmetric encryption employs two distinct keys: a public key and a private key.
Public Key:
The public key is widely shared and can be freely distributed. It is used to encrypt data or messages that are intended for the owner of the corresponding private key.
Public keys are typically used for encryption and verifying digital signatures.
Private Key:
The private key is kept secret and is known only to the key owner. It is used for decrypting messages that were encrypted with the corresponding public key.
Private keys are used for decryption and creating digital signatures.
How It Works:
If Alice wants to send a secure message to Bob, she uses Bob's public key to encrypt the message. Once encrypted, only Bob, with his private key, can decrypt and access the original message.
Digital signatures work in the opposite way. If Bob wants to sign a message to prove it comes from him, he uses his private key to create a unique digital signature. Others can verify the signature using Bob's public key, ensuring the message's authenticity and integrity.
Security:
Asymmetric encryption provides a higher level of security compared to symmetric encryption because compromising one key (either the public or private key) does not compromise the other.
The security of asymmetric encryption relies on the difficulty of certain mathematical problems, such as factoring large numbers, making it computationally infeasible to derive the private key from the public key.
Common Algorithms:
RSA (Rivest-Shamir-Adleman) and ECC (Elliptic Curve Cryptography) are among the most widely used asymmetric encryption algorithms.
Applications:
Asymmetric encryption is used in various applications, including secure communication over the internet, digital signatures for authentication, and the establishment of secure channels in protocols like SSL/TLS.
In summary, asymmetric encryption is a crucial component of modern cryptographic systems, providing a secure means of communication and data protection in a digital world.
Analysis of Cryptography Techniques
Cryptography is a technique used today hiding any confidential information from the attack of an intruder. Today data communication mainly depends upon digital data communication, where prior requirement is data security, so that data should reach to the intended user. The protection of multimedia data, sensitive information like credit cards, banking transactions and social security numbers is becoming very important. The protection of these confidential data from unauthorized access can be done with many encryption techniques. So for providing data security many cryptography techniques are employed, such as symmetric and asymmetric techniques. In this review paper different asymmetric cryptography techniques, such as RSA (Rivest Shamir and Adleman), Diffie-Hellman, DSA (Digital Signature Algorithm), ECC (Elliptic curve cryptography) are analyzed. Also in this paper, a survey on existing work which uses different techniques for image encryption is done and a general introduction about cryptography is also given. This study extends the performance parameters used in encryption processes and analyzing on their security issues.
Computer Security (Cryptography) Ch01
This document discusses computer security and network cryptography. It begins by explaining how organizations can use cryptosystems like symmetric and asymmetric encryption to protect data. Symmetric encryption is faster but requires secure key exchange, while asymmetric encryption uses public and private key pairs. The document then defines cryptography terminology and components like plaintext, ciphertext, encryption, decryption, and cryptanalysis. It describes techniques like substitution and transposition ciphers. The rest of the document discusses encryption models, algorithms, and cryptanalysis methods like ciphertext-only and known-plaintext attacks.
information technology cryptography Msc chapter 1-4.pdf
This document provides an overview of cryptography and network security topics covered in a course. It discusses definitions of cryptography, security attacks and services, symmetric and asymmetric encryption mechanisms. Specific topics covered include classical encryption techniques, modern encryption standards like DES and AES, public key cryptography principles like RSA, and number theory concepts used in cryptography. Network security frameworks and current issues are also mentioned.
Recommended
A Survey on Cryptographic Techniques for Network Security.pdf
This document summarizes and compares several cryptographic techniques for network security, including AES, 3DES, Blowfish, and DES. It provides an overview of each algorithm, including key sizes and block sizes. AES is identified as providing better performance and security compared to other algorithms like 3DES and DES. The document also reviews related literature on encrypting data for network security and enhancing encryption methods. It concludes that AES is a better encryption algorithm than alternatives like 3DES and DES due to its performance and security against attacks like brute force.
Lesson 04 - Symmetric and Asymmetric Key Encryptions (1).pptx
1. Symmetric key cryptography uses a single secret key for both encryption and decryption, while asymmetric key cryptography uses two different but mathematically related keys, a public key and a private key.
2. In asymmetric encryption, the public key is used to encrypt messages and its companion private key is used to decrypt messages. Only the recipient who possesses the private key can decrypt messages encrypted with their public key.
3. The essential steps of asymmetric encryption are that each user generates a public-private key pair, places their public key in a register for others, and encrypts messages sent to recipients with their public key which can only be decrypted with the corresponding private key.
Cryptography.pptx
The seminar covered cryptography, including its definition as using Greek words for "hidden" and "writing" to securely transmit information. Cryptography provides confidentiality, integrity, and availability via techniques like encryption, decryption using keys, hashing and symmetric/asymmetric algorithms. Symmetric cryptography uses a single shared key for encryption and decryption while asymmetric uses public/private key pairs. Hashing transforms data to a fixed-length code for integrity checks.
httpswww.youtube.comwatchtime_continue=8&v=rFV0aes0vYAN.docx
https://www.youtube.com/watch?time_continue=8&v=rFV0aes0vYA
Network Security Essentials: Applications and Standards
Sixth Edition
Chapter 2
Symmetric Encryption and
Message Confidentiality
Copyright © 2017 Pearson Education, Inc. All Rights Reserved
If this PowerPoint presentation contains mathematical equations, you may need to check that your computer has the following installed:
1) MathType Plugin
2) Math Player (free versions available)
3) NVDA Reader (free versions available)
This chapter provides a general overview of the subject matter that structures the material in the remainder of the book. We begin with a general discussion of network security services and mechanisms and of the types of attacks they are designed for. Then we develop a general overall model within which the security services and mechanisms can be viewed.
1
Figure 2-1: Simplified Model of Symmetric Encryption
Copyright © 2017 Pearson Education, Inc. All Rights Reserved
A symmetric encryption scheme has five ingredients (Figure 2.1):
• Plaintext: This is the original message or data that is fed into the algorithm
as input.
• Encryption algorithm: The encryption algorithm performs various substitutions
and transformations on the plaintext.
• Secret key: The secret key is also input to the algorithm. The exact substitutions
and transformations performed by the algorithm depend on the key.
• Ciphertext: This is the scrambled message produced as output. It depends on
the plaintext and the secret key. For a given message, two different keys will
produce two different ciphertexts.
• Decryption algorithm: This is essentially the encryption algorithm run in
reverse. It takes the ciphertext and the same secret key and produces the
original plaintext.
2
Requirements (1 of 2)
There are two requirements for secure use of symmetric encryption:
A strong encryption algorithm
Sender and receiver must have obtained copies of the secret key in a secure fashion and must keep the key secure
The security of symmetric encryption depends on the secrecy of the key, not the secrecy of the algorithm
This makes it feasible for widespread use
Copyright © 2017 Pearson Education, Inc. All Rights Reserved
There are two requirements for secure use of symmetric encryption:
1. We need a strong encryption algorithm. At a minimum, we would like the
algorithm to be such that an opponent who knows the algorithm and has
access to one or more ciphertexts would be unable to decipher the ciphertext
or figure out the key. This requirement is usually stated in a stronger form:
The opponent should be unable to decrypt ciphertext or discover the key even
if he or she is in possession of a number of ciphertexts together with the plaintext
that produced each ciphertext.
2. Sender and receiver must have obtained copies of the secret key in a secure
fashion and must keep the key secure. If someone can discover the key and
knows the algorithm, all communication using this key is reada ...
asymmetric encryption.pptx
Asymmetric encryption, also known as public-key cryptography, is a cryptographic system that uses a pair of keys for secure communication. Unlike symmetric encryption, where the same key is used for both encryption and decryption, asymmetric encryption employs two distinct keys: a public key and a private key.
Public Key:
The public key is widely shared and can be freely distributed. It is used to encrypt data or messages that are intended for the owner of the corresponding private key.
Public keys are typically used for encryption and verifying digital signatures.
Private Key:
The private key is kept secret and is known only to the key owner. It is used for decrypting messages that were encrypted with the corresponding public key.
Private keys are used for decryption and creating digital signatures.
How It Works:
If Alice wants to send a secure message to Bob, she uses Bob's public key to encrypt the message. Once encrypted, only Bob, with his private key, can decrypt and access the original message.
Digital signatures work in the opposite way. If Bob wants to sign a message to prove it comes from him, he uses his private key to create a unique digital signature. Others can verify the signature using Bob's public key, ensuring the message's authenticity and integrity.
Security:
Asymmetric encryption provides a higher level of security compared to symmetric encryption because compromising one key (either the public or private key) does not compromise the other.
The security of asymmetric encryption relies on the difficulty of certain mathematical problems, such as factoring large numbers, making it computationally infeasible to derive the private key from the public key.
Common Algorithms:
RSA (Rivest-Shamir-Adleman) and ECC (Elliptic Curve Cryptography) are among the most widely used asymmetric encryption algorithms.
Applications:
Asymmetric encryption is used in various applications, including secure communication over the internet, digital signatures for authentication, and the establishment of secure channels in protocols like SSL/TLS.
In summary, asymmetric encryption is a crucial component of modern cryptographic systems, providing a secure means of communication and data protection in a digital world.
Analysis of Cryptography Techniques
Cryptography is a technique used today hiding any confidential information from the attack of an intruder. Today data communication mainly depends upon digital data communication, where prior requirement is data security, so that data should reach to the intended user. The protection of multimedia data, sensitive information like credit cards, banking transactions and social security numbers is becoming very important. The protection of these confidential data from unauthorized access can be done with many encryption techniques. So for providing data security many cryptography techniques are employed, such as symmetric and asymmetric techniques. In this review paper different asymmetric cryptography techniques, such as RSA (Rivest Shamir and Adleman), Diffie-Hellman, DSA (Digital Signature Algorithm), ECC (Elliptic curve cryptography) are analyzed. Also in this paper, a survey on existing work which uses different techniques for image encryption is done and a general introduction about cryptography is also given. This study extends the performance parameters used in encryption processes and analyzing on their security issues.
Computer Security (Cryptography) Ch01
This document discusses computer security and network cryptography. It begins by explaining how organizations can use cryptosystems like symmetric and asymmetric encryption to protect data. Symmetric encryption is faster but requires secure key exchange, while asymmetric encryption uses public and private key pairs. The document then defines cryptography terminology and components like plaintext, ciphertext, encryption, decryption, and cryptanalysis. It describes techniques like substitution and transposition ciphers. The rest of the document discusses encryption models, algorithms, and cryptanalysis methods like ciphertext-only and known-plaintext attacks.
information technology cryptography Msc chapter 1-4.pdf
This document provides an overview of cryptography and network security topics covered in a course. It discusses definitions of cryptography, security attacks and services, symmetric and asymmetric encryption mechanisms. Specific topics covered include classical encryption techniques, modern encryption standards like DES and AES, public key cryptography principles like RSA, and number theory concepts used in cryptography. Network security frameworks and current issues are also mentioned.
chapter 1-4.pdf
The document discusses classical encryption techniques such as the Caesar cipher, monoalphabetic substitution cipher, and Playfair cipher. The Caesar cipher replaces each letter with the letter three positions down the alphabet. The monoalphabetic substitution cipher randomly maps each plaintext letter to a ciphertext letter. The Playfair cipher encrypts pairs of letters based on their positions in a 5x5 grid generated from the key. Cryptanalysis techniques like frequency analysis that exploit patterns in letter frequencies are also covered.
International Journal of Engineering Research and Development (IJERD)
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Cryptography ppt
This document discusses cryptography, which is the science of secure communication. It covers the basics of cryptography including its objectives, components, terminology, types, and advantages. Specifically, it explains how cryptography ensures confidentiality, integrity, and authentication of information. It also discusses symmetric and asymmetric encryption methods. Symmetric encryption uses a shared key for encryption and decryption while asymmetric encryption uses public and private key pairs. The document highlights how cryptography provides secure communication methods and is important for both military and everyday applications.
Cryptography and Network Security-ch1-4.pptx
The document describes various classical encryption techniques. It discusses symmetric encryption where the same key is used for encryption and decryption. Some classical ciphers described include the Caesar cipher which shifts letters by a fixed number, monoalphabetic substitution ciphers which map each plaintext letter to a ciphertext letter, and the Playfair cipher which encrypts pairs of letters based on a 5x5 keyword matrix. It also covers cryptanalysis techniques like frequency analysis to crack classical ciphers.
Cryptography and network security
This document provides an overview of cryptography and network security. It discusses what cryptography is, the basic terminology used in cryptography like plaintext, ciphertext, encryption, algorithms and keys. It explains the two main types of cryptographic functions: symmetric key cryptography which uses a single shared key between sender and receiver, and asymmetric key cryptography which uses public and private key pairs. It also outlines two network security models - the model for network security and the network access security model.
Cryptography and network security
This document provides an overview of cryptography and network security. It discusses what cryptography is, the basic terminology used in cryptography like plaintext, ciphertext, encryption, algorithms and keys. It explains the two main types of cryptographic functions: symmetric key cryptography which uses a single shared key between sender and receiver, and asymmetric key cryptography which uses public and private key pairs. It also outlines two network security models - the model for network security and the network access security model.
network security
This document discusses various aspects of network security, including:
1. Secure communication techniques like confidentiality, authentication, message integrity, and access control.
2. Encryption methods like symmetric encryption (DES, 3DES, AES), asymmetric encryption (RSA, Diffie-Hellman), and digital certificates.
3. Network security protocols like SSL/TLS, VPNs, and techniques for securing wireless networks like WEP.
cryptography
Cryptography involves converting plain text into cipher text to secure communication. There are two main types: private/symmetric key cryptography uses a single shared key for encryption and decryption, while public/asymmetric key cryptography uses two keys - a public key to encrypt and a private key to decrypt. Private key cryptography is faster but requires secure key exchange, while public key allows communication without pre-shared keys and enables authentication and digital signatures.
Networksecurity1 1
This document provides an overview of network security and cryptography. It discusses the history and basic concepts of networking and security. The document covers risk management, network threats like viruses and denial of service attacks. It also explains different network security methods like virtual private networks (VPNs), firewalls, and IPSec. Cryptography techniques like secret key cryptography, public key cryptography, hash functions, and authentication methods are summarized. Popular cryptographic algorithms and protocols like PGP, SHA, and AAA servers are also mentioned.
Types of Cryptosystem and Cryptographic Attack
The document discusses different types of cryptosystems and cryptographic attacks. It describes symmetric key encryption, which uses the same key to encrypt and decrypt, and asymmetric key encryption, which uses different but mathematically related public and private keys. It also outlines various assumptions an attacker may make and different attack methods, including ciphertext-only attacks, known plaintext attacks, chosen plaintext attacks, and dictionary attacks. The goal of an attacker is to break the cryptosystem and determine the secret key in order to decrypt ciphertext.
Cryptography
Cryptography is the process of securing communication by transforming information into an unreadable format called cipher text. There are two main methods - symmetric encryption which uses a single secret key for both encryption and decryption, and asymmetric encryption which uses two different but mathematically linked keys, a public key for encryption and a private key for decryption. Symmetric encryption is more efficient for encrypting long messages but key distribution is a challenge, while asymmetric encryption uses different public and private keys to overcome this issue but is more complex computationally.
Encryption
This document discusses basic concepts in cryptography including plaintext, ciphertext, ciphers, keys, encryption, decryption, cryptanalysis, and cryptology. It defines these terms and explains symmetric encryption uses one key for both encryption and decryption while asymmetric encryption uses public and private key pairs, with the public key used for encryption and private key for decryption. Symmetric encryption requires secure key exchange while asymmetric addresses this issue but is slower. Cryptography algorithms can be classified as symmetric using algorithms like DES, AES, RC4 and RC6, or asymmetric using RSA, DSA and Diffie-Hellman public key encryption.
CONVENTIONAL ENCRYPTION
Conventional Encryption, also known as symmetric encryption, uses the same key for both encryption and decryption. It has the following properties:
- The sender encrypts the plaintext using a secret key known to both sender and receiver.
- The encrypted data called ciphertext is transmitted to the receiver.
- The receiver decrypts the ciphertext using the same secret key to retrieve the original plaintext.
- It is a fast and simple encryption technique as it uses a single key. However, secure key distribution between communicating parties is a challenge.
- The encryption and decryption algorithms are reversible i.e. decrypting the ciphertext using the secret key reproduces the original plaintext.
- Popular symmetric encryption algorithms are AES
Analysis of Cryptographic Algorithms for Network Security
This document discusses and analyzes various cryptographic algorithms used for network security. It begins with definitions of key cryptographic terms like plain text, cipher text, encryption, decryption, and keys. It then describes different types of cryptographic schemes, including symmetric, asymmetric, and hash functions. Specific algorithms are analyzed like DES, AES, RSA, and Diffie-Hellman. Factors to consider when selecting a cryptographic algorithm like speed, memory requirements, security needs, and data type are also discussed. Overall the document provides a comprehensive overview and comparison of cryptographic algorithms and their applications for network security.
Pooguzhali
This document discusses public key cryptography and the RSA algorithm. It provides explanations of public key encryption including its key components like plaintext, encryption algorithm, public and private keys, and decryption algorithm. It then describes the conventional encryption method versus public key encryption. Finally, it explains the RSA algorithm in detail, including how it generates key pairs, how encryption and decryption works using the keys, and some of the mathematical concepts that make RSA secure like the difficulty of factoring large numbers.
A REVIEW STUDY OF CRYPTOGRAPHY TECHNIQUES
This document reviews and summarizes various cryptography techniques. It discusses how cryptography provides security for data transmission by converting plain text into cipher text using encryption and back using decryption. The two main types of cryptography discussed are symmetric key cryptography which uses a single secret key for both encryption and decryption, and asymmetric key cryptography which uses public/private key pairs. Specific techniques covered include DES, 3DES, AES, and RSA.
Confidentiality and Privacy Controls.pptx
The document discusses controls for protecting confidentiality and privacy of sensitive information. It identifies classifying information, encryption, access controls, and training as key controls. Encryption is the process of encoding information to protect it during transmission and storage using either symmetric encryption with one key or asymmetric encryption using public and private key pairs. The two main goals are to prevent unauthorized access to confidential information and protect personal privacy through techniques like data masking.
symmetric cipher model.pptx
This document discusses symmetric encryption, also known as conventional or single-key encryption. Symmetric encryption uses a single key that is known to both the sender and receiver to encrypt plaintext into ciphertext and decrypt ciphertext back to plaintext. The document defines basic terminology related to symmetric encryption like plaintext, ciphertext, cipher, key, encryption, and decryption. It also discusses the principles of cryptography used in symmetric encryption like substitution and transposition ciphers. The document outlines advantages of symmetric encryption like speed but also disadvantages related to securely distributing the shared secret key between communicating parties.
Public key cryptography
This document summarizes public key cryptography and asymmetric encryption algorithms. It discusses how public key cryptography uses two different but mathematically related keys, a public key for encryption and a private key for decryption. The public key can be shared openly, while the private key is kept secret by the recipient. It also describes how asymmetric algorithms are slower than symmetric algorithms but allow anyone to encrypt messages for a recipient using their public key, with only the recipient able to decrypt it with their private key. Examples of asymmetric algorithms discussed include RSA.
2. public key cryptography and RSA
Public Key Cryptography,Public-Key Cryptosystem,Rivest-Shamir-Adleman (RSA) Scheme,The Security of RSA,Optimal Asymmetric Encryption Padding (OAEP)
Mechanical Engineering on AAI Summer Training Report-003.pdf
Mechanical Engineering PROJECT REPORT ON SUMMER VOCATIONAL TRAINING
AT MBB AIRPORT
原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
【主营项目】
一.毕业证【微bwp0011】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微bwp0011】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
More Related Content
Similar to NSC PPT 463.pdf
chapter 1-4.pdf
The document discusses classical encryption techniques such as the Caesar cipher, monoalphabetic substitution cipher, and Playfair cipher. The Caesar cipher replaces each letter with the letter three positions down the alphabet. The monoalphabetic substitution cipher randomly maps each plaintext letter to a ciphertext letter. The Playfair cipher encrypts pairs of letters based on their positions in a 5x5 grid generated from the key. Cryptanalysis techniques like frequency analysis that exploit patterns in letter frequencies are also covered.
International Journal of Engineering Research and Development (IJERD)
journal publishing, how to publish research paper, Call For research paper, international journal, publishing a paper, IJERD, journal of science and technology, how to get a research paper published, publishing a paper, publishing of journal, publishing of research paper, reserach and review articles, IJERD Journal, How to publish your research paper, publish research paper, open access engineering journal, Engineering journal, Mathemetics journal, Physics journal, Chemistry journal, Computer Engineering, Computer Science journal, how to submit your paper, peer reviw journal, indexed journal, reserach and review articles, engineering journal, www.ijerd.com, research journals,
yahoo journals, bing journals, International Journal of Engineering Research and Development, google journals, hard copy of journal
Cryptography ppt
This document discusses cryptography, which is the science of secure communication. It covers the basics of cryptography including its objectives, components, terminology, types, and advantages. Specifically, it explains how cryptography ensures confidentiality, integrity, and authentication of information. It also discusses symmetric and asymmetric encryption methods. Symmetric encryption uses a shared key for encryption and decryption while asymmetric encryption uses public and private key pairs. The document highlights how cryptography provides secure communication methods and is important for both military and everyday applications.
Cryptography and Network Security-ch1-4.pptx
The document describes various classical encryption techniques. It discusses symmetric encryption where the same key is used for encryption and decryption. Some classical ciphers described include the Caesar cipher which shifts letters by a fixed number, monoalphabetic substitution ciphers which map each plaintext letter to a ciphertext letter, and the Playfair cipher which encrypts pairs of letters based on a 5x5 keyword matrix. It also covers cryptanalysis techniques like frequency analysis to crack classical ciphers.
Cryptography and network security
This document provides an overview of cryptography and network security. It discusses what cryptography is, the basic terminology used in cryptography like plaintext, ciphertext, encryption, algorithms and keys. It explains the two main types of cryptographic functions: symmetric key cryptography which uses a single shared key between sender and receiver, and asymmetric key cryptography which uses public and private key pairs. It also outlines two network security models - the model for network security and the network access security model.
Cryptography and network security
This document provides an overview of cryptography and network security. It discusses what cryptography is, the basic terminology used in cryptography like plaintext, ciphertext, encryption, algorithms and keys. It explains the two main types of cryptographic functions: symmetric key cryptography which uses a single shared key between sender and receiver, and asymmetric key cryptography which uses public and private key pairs. It also outlines two network security models - the model for network security and the network access security model.
network security
This document discusses various aspects of network security, including:
1. Secure communication techniques like confidentiality, authentication, message integrity, and access control.
2. Encryption methods like symmetric encryption (DES, 3DES, AES), asymmetric encryption (RSA, Diffie-Hellman), and digital certificates.
3. Network security protocols like SSL/TLS, VPNs, and techniques for securing wireless networks like WEP.
cryptography
Cryptography involves converting plain text into cipher text to secure communication. There are two main types: private/symmetric key cryptography uses a single shared key for encryption and decryption, while public/asymmetric key cryptography uses two keys - a public key to encrypt and a private key to decrypt. Private key cryptography is faster but requires secure key exchange, while public key allows communication without pre-shared keys and enables authentication and digital signatures.
Networksecurity1 1
This document provides an overview of network security and cryptography. It discusses the history and basic concepts of networking and security. The document covers risk management, network threats like viruses and denial of service attacks. It also explains different network security methods like virtual private networks (VPNs), firewalls, and IPSec. Cryptography techniques like secret key cryptography, public key cryptography, hash functions, and authentication methods are summarized. Popular cryptographic algorithms and protocols like PGP, SHA, and AAA servers are also mentioned.
Types of Cryptosystem and Cryptographic Attack
The document discusses different types of cryptosystems and cryptographic attacks. It describes symmetric key encryption, which uses the same key to encrypt and decrypt, and asymmetric key encryption, which uses different but mathematically related public and private keys. It also outlines various assumptions an attacker may make and different attack methods, including ciphertext-only attacks, known plaintext attacks, chosen plaintext attacks, and dictionary attacks. The goal of an attacker is to break the cryptosystem and determine the secret key in order to decrypt ciphertext.
Cryptography
Cryptography is the process of securing communication by transforming information into an unreadable format called cipher text. There are two main methods - symmetric encryption which uses a single secret key for both encryption and decryption, and asymmetric encryption which uses two different but mathematically linked keys, a public key for encryption and a private key for decryption. Symmetric encryption is more efficient for encrypting long messages but key distribution is a challenge, while asymmetric encryption uses different public and private keys to overcome this issue but is more complex computationally.
Encryption
This document discusses basic concepts in cryptography including plaintext, ciphertext, ciphers, keys, encryption, decryption, cryptanalysis, and cryptology. It defines these terms and explains symmetric encryption uses one key for both encryption and decryption while asymmetric encryption uses public and private key pairs, with the public key used for encryption and private key for decryption. Symmetric encryption requires secure key exchange while asymmetric addresses this issue but is slower. Cryptography algorithms can be classified as symmetric using algorithms like DES, AES, RC4 and RC6, or asymmetric using RSA, DSA and Diffie-Hellman public key encryption.
CONVENTIONAL ENCRYPTION
Conventional Encryption, also known as symmetric encryption, uses the same key for both encryption and decryption. It has the following properties:
- The sender encrypts the plaintext using a secret key known to both sender and receiver.
- The encrypted data called ciphertext is transmitted to the receiver.
- The receiver decrypts the ciphertext using the same secret key to retrieve the original plaintext.
- It is a fast and simple encryption technique as it uses a single key. However, secure key distribution between communicating parties is a challenge.
- The encryption and decryption algorithms are reversible i.e. decrypting the ciphertext using the secret key reproduces the original plaintext.
- Popular symmetric encryption algorithms are AES
Analysis of Cryptographic Algorithms for Network Security
This document discusses and analyzes various cryptographic algorithms used for network security. It begins with definitions of key cryptographic terms like plain text, cipher text, encryption, decryption, and keys. It then describes different types of cryptographic schemes, including symmetric, asymmetric, and hash functions. Specific algorithms are analyzed like DES, AES, RSA, and Diffie-Hellman. Factors to consider when selecting a cryptographic algorithm like speed, memory requirements, security needs, and data type are also discussed. Overall the document provides a comprehensive overview and comparison of cryptographic algorithms and their applications for network security.
Pooguzhali
This document discusses public key cryptography and the RSA algorithm. It provides explanations of public key encryption including its key components like plaintext, encryption algorithm, public and private keys, and decryption algorithm. It then describes the conventional encryption method versus public key encryption. Finally, it explains the RSA algorithm in detail, including how it generates key pairs, how encryption and decryption works using the keys, and some of the mathematical concepts that make RSA secure like the difficulty of factoring large numbers.
A REVIEW STUDY OF CRYPTOGRAPHY TECHNIQUES
This document reviews and summarizes various cryptography techniques. It discusses how cryptography provides security for data transmission by converting plain text into cipher text using encryption and back using decryption. The two main types of cryptography discussed are symmetric key cryptography which uses a single secret key for both encryption and decryption, and asymmetric key cryptography which uses public/private key pairs. Specific techniques covered include DES, 3DES, AES, and RSA.
Confidentiality and Privacy Controls.pptx
The document discusses controls for protecting confidentiality and privacy of sensitive information. It identifies classifying information, encryption, access controls, and training as key controls. Encryption is the process of encoding information to protect it during transmission and storage using either symmetric encryption with one key or asymmetric encryption using public and private key pairs. The two main goals are to prevent unauthorized access to confidential information and protect personal privacy through techniques like data masking.
symmetric cipher model.pptx
This document discusses symmetric encryption, also known as conventional or single-key encryption. Symmetric encryption uses a single key that is known to both the sender and receiver to encrypt plaintext into ciphertext and decrypt ciphertext back to plaintext. The document defines basic terminology related to symmetric encryption like plaintext, ciphertext, cipher, key, encryption, and decryption. It also discusses the principles of cryptography used in symmetric encryption like substitution and transposition ciphers. The document outlines advantages of symmetric encryption like speed but also disadvantages related to securely distributing the shared secret key between communicating parties.
Public key cryptography
This document summarizes public key cryptography and asymmetric encryption algorithms. It discusses how public key cryptography uses two different but mathematically related keys, a public key for encryption and a private key for decryption. The public key can be shared openly, while the private key is kept secret by the recipient. It also describes how asymmetric algorithms are slower than symmetric algorithms but allow anyone to encrypt messages for a recipient using their public key, with only the recipient able to decrypt it with their private key. Examples of asymmetric algorithms discussed include RSA.
2. public key cryptography and RSA
Public Key Cryptography,Public-Key Cryptosystem,Rivest-Shamir-Adleman (RSA) Scheme,The Security of RSA,Optimal Asymmetric Encryption Padding (OAEP)
Similar to NSC PPT 463.pdf (20)
International Journal of Engineering Research and Development (IJERD)
International Journal of Engineering Research and Development (IJERD)
Analysis of Cryptographic Algorithms for Network Security
Analysis of Cryptographic Algorithms for Network Security
Recently uploaded
Mechanical Engineering on AAI Summer Training Report-003.pdf
Mechanical Engineering PROJECT REPORT ON SUMMER VOCATIONAL TRAINING
AT MBB AIRPORT
原版制作(Humboldt毕业证书)柏林大学毕业证学位证一模一样
原件一模一样【微信：bwp0011】《(Humboldt毕业证书)柏林大学毕业证学位证》【微信：bwp0011】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问微bwp0011
【主营项目】
一.毕业证【微bwp0011】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【微bwp0011】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Assistant Engineer (Chemical) Interview Questions.pdf
These are interview questions for the post of Assistant Engineer (Chemical)
Sri Guru Hargobind Ji - Bandi Chor Guru.pdf
Sri Guru Hargobind Ji (19 June 1595 - 3 March 1644) is revered as the Sixth Nanak.
• On 25 May 1606 Guru Arjan nominated his son Sri Hargobind Ji as his successor. Shortly
afterwards, Guru Arjan was arrested, tortured and killed by order of the Mogul Emperor
Jahangir.
• Guru Hargobind's succession ceremony took place on 24 June 1606. He was barely
eleven years old when he became 6th Guru.
• As ordered by Guru Arjan Dev Ji, he put on two swords, one indicated his spiritual
authority (PIRI) and the other, his temporal authority (MIRI). He thus for the first time
initiated military tradition in the Sikh faith to resist religious persecution, protect
people’s freedom and independence to practice religion by choice. He transformed
Sikhs to be Saints and Soldier.
• He had a long tenure as Guru, lasting 37 years, 9 months and 3 days
FULL STACK PROGRAMMING - Both Front End and Back End
This ppt gives details about Full Stack Programming and its basics.
SCALING OF MOS CIRCUITS m .pptx
this ppt explains about scaling parameters of the mosfet it is basically vlsi subject
Supermarket Management System Project Report.pdf
Supermarket management is a stand-alone J2EE using Eclipse Juno program.
This project contains all the necessary required information about maintaining
the supermarket billing system.
The core idea of this project to minimize the paper work and centralize the
data. Here all the communication is taken in secure manner. That is, in this
application the information will be stored in client itself. For further security the
data base is stored in the back-end oracle and so no intruders can access it.
AI in customer support Use cases solutions development and implementation.pdf
AI in customer support will integrate with emerging technologies such as augmented reality (AR) and virtual reality (VR) to enhance service delivery. AR-enabled smart glasses or VR environments will provide immersive support experiences, allowing customers to visualize solutions, receive step-by-step guidance, and interact with virtual support agents in real-time. These technologies will bridge the gap between physical and digital experiences, offering innovative ways to resolve issues, demonstrate products, and deliver personalized training and support.
https://www.leewayhertz.com/ai-in-customer-support/#How-does-AI-work-in-customer-support
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...Paris Salesforce Developer Group
Build the Next Generation of Apps with the Einstein 1 Platform.
Rejoignez Philippe Ozil pour une session de workshops qui vous guidera à travers les détails de la plateforme Einstein 1, l'importance des données pour la création d'applications d'intelligence artificielle et les différents outils et technologies que Salesforce propose pour vous apporter tous les bénéfices de l'IA.一比一原版(osu毕业证书)美国俄勒冈州立大学毕业证如何办理
原版一模一样【微信：741003700 】【(osu毕业证书)美国俄勒冈州立大学毕业证成绩单】【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
【主营项目】
一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】外观非常简单，由纸质材料制成，上面印有校徽、校名、毕业生姓名、专业等信息。
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】格式相对统一，各专业都有相应的模板。通常包括以下部分：
校徽：象征着学校的荣誉和传承。
校名:学校英文全称
授予学位：本部分将注明获得的具体学位名称。
毕业生姓名：这是最重要的信息之一，标志着该证书是由特定人员获得的。
颁发日期：这是毕业正式生效的时间，也代表着毕业生学业的结束。
其他信息：根据不同的专业和学位，可能会有一些特定的信息或章节。
办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】价值很高，需要妥善保管。一般来说，应放置在安全、干燥、防潮的地方，避免长时间暴露在阳光下。如需使用，最好使用复印件而不是原件，以免丢失。
综上所述，办理(osu毕业证书)美国俄勒冈州立大学毕业证【微信：741003700 】是证明身份和学历的高价值文件。外观简单庄重，格式统一，包括重要的个人信息和发布日期。对持有人来说，妥善保管是非常重要的。
Open Channel Flow: fluid flow with a free surface
Open Channel Flow: This topic focuses on fluid flow with a free surface, such as in rivers, canals, and drainage ditches. Key concepts include the classification of flow types (steady vs. unsteady, uniform vs. non-uniform), hydraulic radius, flow resistance, Manning's equation, critical flow conditions, and energy and momentum principles. It also covers flow measurement techniques, gradually varied flow analysis, and the design of open channels. Understanding these principles is vital for effective water resource management and engineering applications.
SELENIUM CONF -PALLAVI SHARMA - 2024.pdf
Begin your journey to contribute to Selenium - A Talk at the Selenium Conference 2024
Tools & Techniques for Commissioning and Maintaining PV Systems W-Animations ...
Join us for this solutions-based webinar on the tools and techniques for commissioning and maintaining PV Systems. In this session, we'll review the process of building and maintaining a solar array, starting with installation and commissioning, then reviewing operations and maintenance of the system. This course will review insulation resistance testing, I-V curve testing, earth-bond continuity, ground resistance testing, performance tests, visual inspections, ground and arc fault testing procedures, and power quality analysis.
Fluke Solar Application Specialist Will White is presenting on this engaging topic:
Will has worked in the renewable energy industry since 2005, first as an installer for a small east coast solar integrator before adding sales, design, and project management to his skillset. In 2022, Will joined Fluke as a solar application specialist, where he supports their renewable energy testing equipment like IV-curve tracers, electrical meters, and thermal imaging cameras. Experienced in wind power, solar thermal, energy storage, and all scales of PV, Will has primarily focused on residential and small commercial systems. He is passionate about implementing high-quality, code-compliant installation techniques.
Accident detection system project report.pdf
The Rapid growth of technology and infrastructure has made our lives easier. The
advent of technology has also increased the traffic hazards and the road accidents take place
frequently which causes huge loss of life and property because of the poor emergency facilities.
Many lives could have been saved if emergency service could get accident information and
reach in time. Our project will provide an optimum solution to this draw back. A piezo electric
sensor can be used as a crash or rollover detector of the vehicle during and after a crash. With
signals from a piezo electric sensor, a severe accident can be recognized. According to this
project when a vehicle meets with an accident immediately piezo electric sensor will detect the
signal or if a car rolls over. Then with the help of GSM module and GPS module, the location
will be sent to the emergency contact. Then after conforming the location necessary action will
be taken. If the person meets with a small accident or if there is no serious threat to anyone’s
life, then the alert message can be terminated by the driver by a switch provided in order to
avoid wasting the valuable time of the medical rescue team.
Ericsson LTE Throughput Troubleshooting Techniques.ppt
Ericsson LTE Throughput Troubleshooting Techniques
Beckhoff Programmable Logic Control Overview Presentation
This presentation is to describe the overview of PLC Beckhoff for beginners
Digital Twins Computer Networking Paper Presentation.pptx
A Digital Twin in computer networking is a virtual representation of a physical network, used to simulate, analyze, and optimize network performance and reliability. It leverages real-time data to enhance network management, predict issues, and improve decision-making processes.
Recently uploaded (20)
Mechanical Engineering on AAI Summer Training Report-003.pdf
Mechanical Engineering on AAI Summer Training Report-003.pdf
Assistant Engineer (Chemical) Interview Questions.pdf
Assistant Engineer (Chemical) Interview Questions.pdf
FULL STACK PROGRAMMING - Both Front End and Back End
FULL STACK PROGRAMMING - Both Front End and Back End
AI in customer support Use cases solutions development and implementation.pdf
AI in customer support Use cases solutions development and implementation.pdf
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...
AI + Data Community Tour - Build the Next Generation of Apps with the Einstei...
openshift technical overview - Flow of openshift containerisatoin
openshift technical overview - Flow of openshift containerisatoin
Tools & Techniques for Commissioning and Maintaining PV Systems W-Animations ...
Tools & Techniques for Commissioning and Maintaining PV Systems W-Animations ...
Ericsson LTE Throughput Troubleshooting Techniques.ppt
Ericsson LTE Throughput Troubleshooting Techniques.ppt
Beckhoff Programmable Logic Control Overview Presentation
Beckhoff Programmable Logic Control Overview Presentation
Digital Twins Computer Networking Paper Presentation.pptx
Digital Twins Computer Networking Paper Presentation.pptx
NSC PPT 463.pdf
- 1. CONVENTIONAL ENCRYPTION MODEL B.Jayanth Reddy 19P61A0425
- 2. DEFINATION: • Conventional encryption is a cryptographic system that uses the same key used by the sender to encrypt the message and by the receiver to decrypt the message. It was the only type of encryption in use prior to the development of public-key encryption.
- 3. INTRODUCTION: • • Suppose A wants to send a message to B, that message is called plaintext. Now, to avoid hackers reading plaintext, the plaintext is encrypted using an algorithm and a secret key (at 1). This encrypted plaintext is called ciphertext. Using the same secret key and encryption algorithm run in reverse(at 2), B can get plaintext of A, and thus the message is read and security is maintained. The idea that uses in this technique is very old and that’s why this model is called conventional encryption.
- 4. Below is a figure that illustrates this concept.
- 5. Conventional encryption has mainly 5 ingredients : • • • Plain text – It is the original data that is given to the algorithm as an input. Encryption algorithm – This encryption algorithm performs various transformations on plain text to convert it into ciphertext. Secret key – The secret key is also an input to the algorithm. The encryption algorithm will produce different outputs based on the keys used at that time.
- 6. • • Ciphertext – It contains encrypted information because it contains a form of original plaintext that is unreadable by a human or computer without proper cipher to decrypt it. It is output from the algorithm. Decryption algorithm – This is used to run encryption algorithms in reverse. Ciphertext and Secret key is input here and it produces plain text as output.
- 7. Requirements for secure use of conventional encryption : 1. 2. We need a strong encryption algorithm. The sender and Receiver must have obtained copies of the secret key in a secure fashion and must keep the key secure.
- 8. Advantages of Conventional Encryption : 1. 2. 3. Simple – This type of encryption is easy to carry out. Uses fewer computer resources – Conventional encryption does not require a lot of computer resources when compared to public-key encryption. Fast – Conventional encryption is much faster than asymmetric key encryption.
- 9. Disadvantages of Conventional Encryption Model: 1. 2. 3. 4. Origin and authenticity of the message cannot be guaranteed, since both sender and receiver use the same key, messages cannot be verified to have come from a particular user. It isn’t much secured when compared to public-key encryption. If the receiver lost the key, he/she cant decrypt the message and thus making the whole process useless. This scheme does not scale well to a large number of users because both the sender and the receiver have to agree on a secret key before transmission.
- 10. THANK YOU