Cryptography
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This document discusses the history of encryption and cryptography. It covers early techniques like steganography and transposition ciphers where plaintext is rearranged. The Caesar and Vigenere ciphers are also explained, where letters are shifted or substituted according to a key. Modern encryption methods are then outlined, including public key infrastructure (PKI) which allows two parties to authenticate each other using digital signatures and public/private key pairs. The document traces encryption techniques over centuries and how they evolved with technological advances to the widespread use of encryption today to secure internet communications and banking.
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Encryption
This document provides an overview of encryption, including its history, types, methods, and uses. It discusses how encryption works by converting plain text into ciphertext using algorithms and keys. The main types of encryption covered are manual, transparent, symmetric, and asymmetric encryption. Symmetric encryption uses one key while asymmetric uses public and private keys. Encryption methods fall into two categories: stream encryption which encrypts text character by character, and block cipher encryption which encrypts in blocks. Encryption is used to protect information on computers and in transit, as well as for confidential medical and transaction records, emails, and digital signatures.
Encryption
This document provides an overview of encryption, including its history, types, methods, and uses. Encryption is the process of converting plain text into ciphertext using an algorithm and key. Historically, ancient Babylonian merchants used carved stones for encryption. There are several types of encryption, including manual, transparent, symmetric, and asymmetric encryption. Encryption methods are categorized as stream or block cipher encryption. Encryption is used to protect information on computers, in transit such as for wireless phones, and to facilitate confidential transactions and digital signatures.
Cryptography Presentation
Cryptography is the process of encrypting and decrypting messages between senders and receivers to maintain integrity, secrecy and protect confidential information. It has a long history dating back to ancient Egypt and is now widely used with both symmetric and asymmetric encryption methods. While some countries have restrictions on cryptography, it is legal and commonly used to protect passwords, online transactions, and communication. When implemented properly, cryptography can securely protect data even if a system is compromised, as was seen when Adobe's encrypted data remained secure despite a data breach.
Cryptography
Cryptography is the science of securing information and communication through encryption. It has a long history dating back to ancient civilizations, but modern cryptography emerged in the early 20th century with the invention of encryption machines like the Enigma and Lorenz ciphers used in World War II. Cryptography serves purposes like authentication, confidentiality, integrity, and non-repudiation. It uses techniques like symmetric encryption with a shared key, asymmetric encryption with public/private key pairs, and hash functions. Cryptography has many applications in digital signatures, smart cards, e-commerce, passwords, and ATMs. While technology has improved security, perfection has not been achieved.
Crytography
This document provides information about cryptography and encryption techniques. It discusses that cryptography is the science of information security and includes techniques to hide information. It then describes three main goals of cryptography: confidentiality, integrity, and authentication. It proceeds to define encryption as converting a message into cipher text and decryption as converting cipher text back to the original message. Finally, it explains the differences between symmetric and asymmetric encryption methods.
My cryptography
A short ppt on Cryptography . It contains just an abstract idea of Cryptography presented by Me for College
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Crytography
This document provides an overview of cryptography including its history, components, terminology, types, and applications. Cryptography is the science of securing communications and ensures confidentiality, integrity, and authentication of messages. It has military and civilian applications and relies on techniques from mathematics, computer science, and electrical engineering. The document discusses symmetric and asymmetric key cryptography, describing how symmetric uses a shared key while asymmetric uses public/private key pairs. Digital signatures and certificates are also covered.
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.
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Encryption
This document provides an overview of encryption, including its history, types, methods, and uses. It discusses how encryption works by converting plain text into ciphertext using algorithms and keys. The main types of encryption covered are manual, transparent, symmetric, and asymmetric encryption. Symmetric encryption uses one key while asymmetric uses public and private keys. Encryption methods fall into two categories: stream encryption which encrypts text character by character, and block cipher encryption which encrypts in blocks. Encryption is used to protect information on computers and in transit, as well as for confidential medical and transaction records, emails, and digital signatures.
Encryption
This document provides an overview of encryption, including its history, types, methods, and uses. Encryption is the process of converting plain text into ciphertext using an algorithm and key. Historically, ancient Babylonian merchants used carved stones for encryption. There are several types of encryption, including manual, transparent, symmetric, and asymmetric encryption. Encryption methods are categorized as stream or block cipher encryption. Encryption is used to protect information on computers, in transit such as for wireless phones, and to facilitate confidential transactions and digital signatures.
Cryptography Presentation
Cryptography is the process of encrypting and decrypting messages between senders and receivers to maintain integrity, secrecy and protect confidential information. It has a long history dating back to ancient Egypt and is now widely used with both symmetric and asymmetric encryption methods. While some countries have restrictions on cryptography, it is legal and commonly used to protect passwords, online transactions, and communication. When implemented properly, cryptography can securely protect data even if a system is compromised, as was seen when Adobe's encrypted data remained secure despite a data breach.
Cryptography
Cryptography is the science of securing information and communication through encryption. It has a long history dating back to ancient civilizations, but modern cryptography emerged in the early 20th century with the invention of encryption machines like the Enigma and Lorenz ciphers used in World War II. Cryptography serves purposes like authentication, confidentiality, integrity, and non-repudiation. It uses techniques like symmetric encryption with a shared key, asymmetric encryption with public/private key pairs, and hash functions. Cryptography has many applications in digital signatures, smart cards, e-commerce, passwords, and ATMs. While technology has improved security, perfection has not been achieved.
Crytography
This document provides information about cryptography and encryption techniques. It discusses that cryptography is the science of information security and includes techniques to hide information. It then describes three main goals of cryptography: confidentiality, integrity, and authentication. It proceeds to define encryption as converting a message into cipher text and decryption as converting cipher text back to the original message. Finally, it explains the differences between symmetric and asymmetric encryption methods.
My cryptography
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Crytography
This document provides an overview of cryptography including its history, components, terminology, types, and applications. Cryptography is the science of securing communications and ensures confidentiality, integrity, and authentication of messages. It has military and civilian applications and relies on techniques from mathematics, computer science, and electrical engineering. The document discusses symmetric and asymmetric key cryptography, describing how symmetric uses a shared key while asymmetric uses public/private key pairs. Digital signatures and certificates are also covered.
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.
Introduction to Cryptography
Cryptography is the practice of securing communication and information by converting plaintext into ciphertext. The document provides an introduction to cryptography including its history from ancient times to the present. It discusses terminology like plaintext, encryption, ciphertext, decryption, and keys. Symmetric key cryptography uses a single key for encryption and decryption while asymmetric key cryptography uses two different keys. Examples of symmetric methods are DES, 3DES, AES, and RC4, while RSA is a common asymmetric method. Applications of cryptography include ATMs, email passwords, e-payments, e-commerce, electronic voting, defense services, securing data, and access control.
Cryptography
The document discusses cryptography concepts including encryption, decryption, symmetric and asymmetric encryption techniques, cryptanalysis methods like brute force attacks, and the importance of secret keys. Symmetric encryption uses a shared secret key by both sender and receiver, while asymmetric encryption uses different public/private keys. Cryptanalysis aims to discover plaintext or keys by techniques like brute force trials or exploiting algorithm weaknesses. Longer cryptographic keys increase the difficulty of brute force attacks breaking the encryption.
Cryptography
Cryptography is the practice and study of hiding information. It involves encrypting plain text into unintelligible cipher text using an algorithm or key, and decrypting cipher text back into plain text. There are two main types of cryptography: symmetric key cryptography which uses the same key to encrypt and decrypt, and asymmetric key cryptography which uses different keys. Cryptography improves security, keeps communications private, and ensures privacy by encoding messages in a way that can only be read by those possessing the decryption key.
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Basic Talk. 90 minute talk to an audience of Freshmen and Sophomores of IIT Bombay on 23/02/10 as a part of Science Week. Organised by Web and Coding Club. Place: GG 101 (Elec Department)
Cryptography
Today in modern era of internet we share some sensitive data to information transmission. but need to ensure security. So we focus on Cryptography modern technique for secure transmission of information over network.
Cryptography
Cryptography is the art and science of securing communication and information by encoding messages so that they are unintelligible to unauthorized parties. It involves techniques for encrypting and decrypting messages to ensure confidentiality, authentication, and integrity. The document defines key terminology related to cryptography such as encryption, decryption, plaintext, ciphertext, and cryptanalysis. It also discusses different types of cryptographic techniques including symmetric and asymmetric encryption as well as cryptographic applications and characteristics.
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This document provides an overview of cryptography concepts including symmetric and asymmetric encryption algorithms, hashing, digital signatures, and public key infrastructure (PKI). Symmetric algorithms like AES use a shared secret key for encryption and decryption while asymmetric algorithms like RSA use separate public and private keys. Digital signatures combine hashing and asymmetric encryption to provide data integrity, non-repudiation and authentication. PKI establishes trust in public keys through a system of digital certificates issued by a trusted certification authority.
Cryptography and Network Security
This document provides an overview of cryptography. It begins with a brief history of cryptography from ancient times to modern computer cryptography. It then defines basic concepts like encryption, decryption, plaintext and ciphertext. It describes different types of cryptography including codes, ciphers, steganography and computer ciphers. It also discusses cryptanalysis, security mechanisms like encryption, digital signatures and hash algorithms. It concludes by explaining applications of cryptography in daily life like emails and secured communication between family members.
Cryptography.ppt
This document provides an overview of cryptography. It begins with basic definitions related to cryptography and a brief history of its use from ancient times to modern ciphers. It then describes different types of ciphers like stream ciphers, block ciphers, and public key cryptosystems. It also covers cryptography methods like symmetric and asymmetric algorithms. Common types of attacks on cryptosystems like brute force, chosen ciphertext, and frequency analysis are also discussed.
cryptography ppt free download
This document presents a seminar on cryptography. It begins with an introduction to cryptography and its purpose in ensuring confidentiality, integrity and accuracy of communications. It then defines cryptography and discusses secret key cryptography which uses a single shared key for encryption and decryption, and public key cryptography which uses separate public and private keys. The document outlines the architecture and process of cryptography, along with common cryptographic algorithms like symmetric and asymmetric key cryptography and hash functions. It also discusses different types of attacks on cryptography like cipher text only and chosen plaintext attacks. The conclusion emphasizes using the appropriate cryptographic algorithm according to the requirements for security and speed of message transmission.
Cryptography
Cryptography is the practice of securing communications and data through encryption techniques. It aims to achieve authentication, privacy, integrity, and non-repudiation. The development of computers allowed for more complex encryption of digital data. There are different types of cryptography including secret key cryptography which uses a single key, and public key cryptography which uses different keys for encryption and decryption. Cryptography provides a secure way to transmit data and is necessary for communications over untrusted networks like the Internet.
Basic cryptography
This slide includes important term related to the cryptography.It Includes its history, types, requirement and examoles as well.
Information Security Cryptography ( L01- introduction )
Introduction to DECRYPTION , which is the basis for the security and protection of information, you will learn the meaning of encryption and decryption and encryption keys used in the examples.
Cryptography
Secret writing refers to cryptography and steganography. Cryptography involves encrypting messages so only authorized users can read them, while steganography hides information within other files or mediums. Common cryptographic techniques include symmetric and asymmetric encryption methods. Symmetric encryption uses a shared key between sender and receiver, while asymmetric encryption uses public and private key pairs. Steganography hides information by embedding it within images or other files.
Criptography
This document provides an overview of cryptography. It discusses traditional cryptography techniques like the Caesar cipher and shift ciphers. It also explains symmetric and asymmetric key cryptography, giving examples like DES, RSA, and their uses. Cryptographic services like authentication, data integrity, non-repudiation, and confidentiality are mentioned. The document notes how cryptography is widely used today in network security, banking transactions, and military communications.
Cryptography Intro
Cryptography is the science of keeping information secret. It allows for confidentiality, authentication, integrity, and nonrepudiation. There are two main types of encryption algorithms: symmetric which uses a single shared key, and asymmetric which uses a public/private key pair. Hashing algorithms are used to verify integrity rather than keep information secret. Common symmetric algorithms include AES and DES, while RSA and DSA are examples of asymmetric algorithms. Cryptanalysis involves attempting to break or bypass cryptography. Cryptography should be used anywhere secret communication or stored data is needed such as in SSL, VPNs, and encrypted file systems.
Cryptography
The document discusses various topics in cryptography including symmetric and asymmetric encryption algorithms. Symmetric algorithms like DES use a shared key for encryption and decryption while asymmetric algorithms like RSA use public-private key pairs. Digital signatures can be generated by encrypting a document hash with a private key and verified using the corresponding public key. Cryptography ensures security goals like confidentiality, integrity, authentication and non-repudiation of digital communications.
Encryption
Encryption encodes information to protect it from unauthorized access. It involves two processes - encryption scrambles the information using an algorithm, while decryption reverses the process to restore the original information. There are two main methods: symmetric key encryption uses the same key to encrypt and decrypt, while asymmetric key encryption uses separate public and private keys.
Cryptography (raza hassan)
Cryptography is the science of using mathematics to encrypt and decrypt data to enable secure storage and transmission of sensitive information. It involves using a key to convert plaintext into ciphertext that can only be read by the intended recipient. There are two main types: symmetric key cryptography which uses the same key for encryption and decryption and is faster, and asymmetric key cryptography which uses two different keys and is more secure but also more complex. Cryptography ensures confidentiality, authentication, integrity, access control and availability of data through techniques like substitution and transposition ciphers.
Applied Cryptography
This document provides an overview of applied cryptography. It begins with definitions of cryptography and discusses techniques like Caesar ciphers and attacks on those ciphers. It then covers cryptographic objectives of confidentiality, integrity, authenticity and non-repudiation. The document summarizes hash functions, symmetric cryptography using keys, asymmetric cryptography using public/private key pairs, digital signatures, and authentication techniques. It provides examples of encrypting and decrypting messages as well as generating and verifying digital signatures for sender authentication and message integrity.
Cryptography
Cryptography is the practice of securing communications and information by converting it into an unintelligible form called cipher text. Some key developments in cryptography include ancient methods like the Caesar cipher, the rise of cipher machines in World War 2 like the Enigma, the development of computerized cryptography with algorithms like DES and AES, and modern uses of public key cryptography and biometrics. Throughout its history, cryptography has evolved from a focus on simple substitution ciphers to the sophisticated mathematical algorithms used today to securely transmit information.
Cryptography its history application and beyond
1) The document discusses the history of cryptography from ancient times to the 19th century.
2) It describes early encryption methods used by Greeks, Spartans, and Julius Caesar that involved transposition ciphers and substitution ciphers.
3) A major advance was the polyalphabetic cipher invented by Leon Battista Alberti in the 15th century, which used multiple cipher alphabets and was considered "unbreakable" at the time.
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Cryptography is the practice of securing communication and information by converting plaintext into ciphertext. The document provides an introduction to cryptography including its history from ancient times to the present. It discusses terminology like plaintext, encryption, ciphertext, decryption, and keys. Symmetric key cryptography uses a single key for encryption and decryption while asymmetric key cryptography uses two different keys. Examples of symmetric methods are DES, 3DES, AES, and RC4, while RSA is a common asymmetric method. Applications of cryptography include ATMs, email passwords, e-payments, e-commerce, electronic voting, defense services, securing data, and access control.
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The document discusses cryptography concepts including encryption, decryption, symmetric and asymmetric encryption techniques, cryptanalysis methods like brute force attacks, and the importance of secret keys. Symmetric encryption uses a shared secret key by both sender and receiver, while asymmetric encryption uses different public/private keys. Cryptanalysis aims to discover plaintext or keys by techniques like brute force trials or exploiting algorithm weaknesses. Longer cryptographic keys increase the difficulty of brute force attacks breaking the encryption.
Cryptography
Cryptography is the practice and study of hiding information. It involves encrypting plain text into unintelligible cipher text using an algorithm or key, and decrypting cipher text back into plain text. There are two main types of cryptography: symmetric key cryptography which uses the same key to encrypt and decrypt, and asymmetric key cryptography which uses different keys. Cryptography improves security, keeps communications private, and ensures privacy by encoding messages in a way that can only be read by those possessing the decryption key.
What is Cryptography?
Basic Talk. 90 minute talk to an audience of Freshmen and Sophomores of IIT Bombay on 23/02/10 as a part of Science Week. Organised by Web and Coding Club. Place: GG 101 (Elec Department)
Cryptography
Today in modern era of internet we share some sensitive data to information transmission. but need to ensure security. So we focus on Cryptography modern technique for secure transmission of information over network.
Cryptography
Cryptography is the art and science of securing communication and information by encoding messages so that they are unintelligible to unauthorized parties. It involves techniques for encrypting and decrypting messages to ensure confidentiality, authentication, and integrity. The document defines key terminology related to cryptography such as encryption, decryption, plaintext, ciphertext, and cryptanalysis. It also discusses different types of cryptographic techniques including symmetric and asymmetric encryption as well as cryptographic applications and characteristics.
Cryptography
This document provides an overview of cryptography concepts including symmetric and asymmetric encryption algorithms, hashing, digital signatures, and public key infrastructure (PKI). Symmetric algorithms like AES use a shared secret key for encryption and decryption while asymmetric algorithms like RSA use separate public and private keys. Digital signatures combine hashing and asymmetric encryption to provide data integrity, non-repudiation and authentication. PKI establishes trust in public keys through a system of digital certificates issued by a trusted certification authority.
Cryptography and Network Security
This document provides an overview of cryptography. It begins with a brief history of cryptography from ancient times to modern computer cryptography. It then defines basic concepts like encryption, decryption, plaintext and ciphertext. It describes different types of cryptography including codes, ciphers, steganography and computer ciphers. It also discusses cryptanalysis, security mechanisms like encryption, digital signatures and hash algorithms. It concludes by explaining applications of cryptography in daily life like emails and secured communication between family members.
Cryptography.ppt
This document provides an overview of cryptography. It begins with basic definitions related to cryptography and a brief history of its use from ancient times to modern ciphers. It then describes different types of ciphers like stream ciphers, block ciphers, and public key cryptosystems. It also covers cryptography methods like symmetric and asymmetric algorithms. Common types of attacks on cryptosystems like brute force, chosen ciphertext, and frequency analysis are also discussed.
cryptography ppt free download
This document presents a seminar on cryptography. It begins with an introduction to cryptography and its purpose in ensuring confidentiality, integrity and accuracy of communications. It then defines cryptography and discusses secret key cryptography which uses a single shared key for encryption and decryption, and public key cryptography which uses separate public and private keys. The document outlines the architecture and process of cryptography, along with common cryptographic algorithms like symmetric and asymmetric key cryptography and hash functions. It also discusses different types of attacks on cryptography like cipher text only and chosen plaintext attacks. The conclusion emphasizes using the appropriate cryptographic algorithm according to the requirements for security and speed of message transmission.
Cryptography
Cryptography is the practice of securing communications and data through encryption techniques. It aims to achieve authentication, privacy, integrity, and non-repudiation. The development of computers allowed for more complex encryption of digital data. There are different types of cryptography including secret key cryptography which uses a single key, and public key cryptography which uses different keys for encryption and decryption. Cryptography provides a secure way to transmit data and is necessary for communications over untrusted networks like the Internet.
Basic cryptography
This slide includes important term related to the cryptography.It Includes its history, types, requirement and examoles as well.
Information Security Cryptography ( L01- introduction )
Introduction to DECRYPTION , which is the basis for the security and protection of information, you will learn the meaning of encryption and decryption and encryption keys used in the examples.
Cryptography
Secret writing refers to cryptography and steganography. Cryptography involves encrypting messages so only authorized users can read them, while steganography hides information within other files or mediums. Common cryptographic techniques include symmetric and asymmetric encryption methods. Symmetric encryption uses a shared key between sender and receiver, while asymmetric encryption uses public and private key pairs. Steganography hides information by embedding it within images or other files.
Criptography
This document provides an overview of cryptography. It discusses traditional cryptography techniques like the Caesar cipher and shift ciphers. It also explains symmetric and asymmetric key cryptography, giving examples like DES, RSA, and their uses. Cryptographic services like authentication, data integrity, non-repudiation, and confidentiality are mentioned. The document notes how cryptography is widely used today in network security, banking transactions, and military communications.
Cryptography Intro
Cryptography is the science of keeping information secret. It allows for confidentiality, authentication, integrity, and nonrepudiation. There are two main types of encryption algorithms: symmetric which uses a single shared key, and asymmetric which uses a public/private key pair. Hashing algorithms are used to verify integrity rather than keep information secret. Common symmetric algorithms include AES and DES, while RSA and DSA are examples of asymmetric algorithms. Cryptanalysis involves attempting to break or bypass cryptography. Cryptography should be used anywhere secret communication or stored data is needed such as in SSL, VPNs, and encrypted file systems.
Cryptography
The document discusses various topics in cryptography including symmetric and asymmetric encryption algorithms. Symmetric algorithms like DES use a shared key for encryption and decryption while asymmetric algorithms like RSA use public-private key pairs. Digital signatures can be generated by encrypting a document hash with a private key and verified using the corresponding public key. Cryptography ensures security goals like confidentiality, integrity, authentication and non-repudiation of digital communications.
Encryption
Encryption encodes information to protect it from unauthorized access. It involves two processes - encryption scrambles the information using an algorithm, while decryption reverses the process to restore the original information. There are two main methods: symmetric key encryption uses the same key to encrypt and decrypt, while asymmetric key encryption uses separate public and private keys.
Cryptography (raza hassan)
Cryptography is the science of using mathematics to encrypt and decrypt data to enable secure storage and transmission of sensitive information. It involves using a key to convert plaintext into ciphertext that can only be read by the intended recipient. There are two main types: symmetric key cryptography which uses the same key for encryption and decryption and is faster, and asymmetric key cryptography which uses two different keys and is more secure but also more complex. Cryptography ensures confidentiality, authentication, integrity, access control and availability of data through techniques like substitution and transposition ciphers.
Applied Cryptography
This document provides an overview of applied cryptography. It begins with definitions of cryptography and discusses techniques like Caesar ciphers and attacks on those ciphers. It then covers cryptographic objectives of confidentiality, integrity, authenticity and non-repudiation. The document summarizes hash functions, symmetric cryptography using keys, asymmetric cryptography using public/private key pairs, digital signatures, and authentication techniques. It provides examples of encrypting and decrypting messages as well as generating and verifying digital signatures for sender authentication and message integrity.
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Cryptography is the practice of securing communications and information by converting it into an unintelligible form called cipher text. Some key developments in cryptography include ancient methods like the Caesar cipher, the rise of cipher machines in World War 2 like the Enigma, the development of computerized cryptography with algorithms like DES and AES, and modern uses of public key cryptography and biometrics. Throughout its history, cryptography has evolved from a focus on simple substitution ciphers to the sophisticated mathematical algorithms used today to securely transmit information.
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1) The document discusses the history of cryptography from ancient times to the 19th century.
2) It describes early encryption methods used by Greeks, Spartans, and Julius Caesar that involved transposition ciphers and substitution ciphers.
3) A major advance was the polyalphabetic cipher invented by Leon Battista Alberti in the 15th century, which used multiple cipher alphabets and was considered "unbreakable" at the time.
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An introductory 2002 tour of cryptography for beginners, covering the basics of the technology and the social context cryptography operates in.
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We use it every day and we rely on it. But what are the roots of cryptography? How were, for example, the ancient Greeks able to protect information from their enemies? In this talk we will go through 5500 years of developing encryption technologies and look at how these work.
From the Un-Distinguished Lecture Series (http://ws.cs.ubc.ca/~udls/). The talk was given Mar. 23, 2007
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The document provides a history of cryptography from ancient times to modern day. It describes early manual encryption techniques used by ancient Greeks and Romans. In the Middle Ages, Arabic scholar Al-Kindi developed frequency analysis to break ciphers. During the Renaissance period, the polyalphabetic cipher was introduced. In World War 1 and 2, mechanical encryption machines like the Enigma and SIGABA were widely used. Modern cryptography began with Claude Shannon's mathematical foundations and the introduction of the Data Encryption Standard (DES) in the 1970s. Public key cryptography was then introduced in the 1970s through Diffie-Hellman key exchange.
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Cryptography involves secret writing and encrypting messages so that only authorized parties can read them. It uses algorithms and keys to encrypt plaintext into ciphertext. Cryptanalysis involves breaking ciphers, while cryptography is designing ciphers. Cryptology encompasses both cryptography and cryptanalysis. Common encryption models involve plaintext being encrypted into ciphertext using a key, which is then transmitted and decrypted by the intended receiver using the same key.
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Cryptography is the practice of securing communications through techniques like encryption and decryption. It involves constructing algorithms to protect information from adversaries and ensure data confidentiality, integrity, and authentication. The main types are transposition ciphers, which rearrange letters, and substitution ciphers, which replace letters. Modern cryptography expanded with computers to encrypt any data and uses symmetric key cryptography, where senders and receivers share a key, and public key cryptography, where they have different keys. It has many applications including ATMs, email, remote access, and smart cards.
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This PPT explains about the term "Cryptography - Encryption & Decryption". This PPT is for beginners and for intermediate developers who want to learn about Cryptography. I have also explained about the various classes which .Net provides for encryption and decryption and some other terms like "AES" and "DES".
Cryptography.ppt
This document provides an overview of cryptography. It defines cryptography as the science of securing messages from attacks. It discusses basic cryptography terms like plain text, cipher text, encryption, decryption, and keys. It describes symmetric key cryptography, where the same key is used for encryption and decryption, and asymmetric key cryptography, which uses different public and private keys. It also covers traditional cipher techniques like substitution and transposition ciphers. The document concludes by listing some applications of cryptography like e-commerce, secure data, and access control.
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This document provides an overview of cryptography concepts including plain text, cipher text, encryption, decryption, and different cryptography techniques. It discusses substitution techniques like Caesar cipher and transposition techniques like columnar transposition. It also covers steganography, symmetric key cryptography including the DES algorithm, and asymmetric key cryptography with an introduction to digital signatures. Key topics covered include encryption algorithms, decryption processes, cryptanalysis, cryptology, and the working of techniques like Caesar cipher, columnar transposition, DES, and digital signatures at a high level.
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This document provides an overview of a cryptography outreach program presented by the Centre for Development of Advanced Computing (C-DAC) in Bangalore, India. The agenda includes introductions to cryptography topics like substitution and transposition ciphers, hash functions, symmetric key cryptography, and asymmetric key cryptography. It then discusses the history of cryptography and provides examples of various cryptographic techniques like Caesar ciphers, the Vigenere cipher, steganography, hash functions like MD5 and SHA, and the differences between symmetric and asymmetric key cryptography.
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This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, encryption algorithms, symmetric and asymmetric encryption, encryption standards like DES and AES, cryptanalysis techniques, and authentication methods. It provides an overview of the key concepts and techniques in cryptography and computer security.
7-cryptography.ppt
This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, encryption algorithms, symmetric and asymmetric encryption, encryption standards like DES and AES, cryptanalysis techniques, and authentication methods. It provides an overview of the key concepts and techniques in cryptography and computer security.
7-cryptography.ppt
This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, encryption algorithms, symmetric and asymmetric encryption, encryption standards like DES and AES, cryptanalysis techniques, and authentication methods. It provides an overview of the key concepts and techniques in cryptography.
detailed presentation on cryptography analysis
The document discusses computer security and cryptography. It covers the basic needs and requirements of secure communication, including secrecy, authentication, and message integrity. It then describes the basics of cryptography, including encryption algorithms, symmetric and asymmetric encryption methods, and some common algorithms like DES, Triple DES, RSA, and El Gamal. It also discusses cryptanalysis techniques for breaking encryption codes. Overall, the document provides a high-level overview of the key concepts and methods in computer security and cryptography.
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This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, encryption algorithms, symmetric and asymmetric encryption, encryption standards like DES and AES, cryptanalysis techniques, and authentication methods. It provides an overview of the key concepts and techniques in cryptography and computer security.
Crytography CertCourse Module 1 & 2.ppt
The document discusses computer security and cryptography. It provides an overview of the basic needs for secure communication including secrecy, authentication, and message integrity. It then describes the basics of cryptography including encryption, decryption, symmetric and asymmetric algorithms. Specific algorithms discussed include DES, Triple DES, RSA and El Gamal. It also covers cryptanalysis techniques for breaking encryption codes.
Best book for the cryptography doctor.ppt
Computer security involves cryptography to provide secure communication. Cryptography has two main components: encryption to hide messages and authentication/integrity to verify user identity and message integrity. There are requirements for secure communication including secrecy, authentication, and message integrity. Cryptographic algorithms like DES and AES are used along with keys to encrypt/decrypt data. Public key cryptography uses different keys for encryption and decryption allowing secure key exchange.
RSA.ppt
This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, encryption algorithms, symmetric and asymmetric encryption, encryption standards like DES and AES, cryptanalysis techniques, and authentication methods. It provides an overview of the key concepts and techniques in cryptography.
the art of the fking dum crypto_basic.ppt
This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, encryption algorithms, symmetric and asymmetric encryption, encryption standards like DES and AES, cryptanalysis techniques, and authentication methods. It provides an overview of the key concepts and techniques in cryptography and computer security.
7 cryptography
This document discusses computer security and cryptography. It covers the basics of cryptography including the needs for secure communication, symmetric and asymmetric encryption algorithms, cryptanalysis techniques, and authentication methods. Specific algorithms discussed include DES, Triple DES, RSA, Diffie-Hellman key exchange, and digital signatures. The document provides an overview of the key concepts and goals of cryptography.
Cryptography
This document provides an overview of cryptography. It begins by defining cryptography as the science of encrypting and decrypting written communications. It then discusses the history of cryptography dating back to ancient Egypt and the Spartans. The document outlines some common cryptosystem services like confidentiality, integrity, and authentication. It also discusses key concepts like keyspace, symmetric and asymmetric encryption algorithms like AES and RSA, and hybrid encryption approaches. The presentation concludes by thanking the audience and offering to answer any questions.
Cryptography & Steganography
Presentation on Cryptography and Steganography. Discussion about tools and techniques of the various types of Crypto Algorithms and forensics.
groupWork.pptx
This document discusses cryptographic techniques used for secure communication. It defines cryptography as the art of secret coding to provide confidentiality, integrity, authentication, and non-repudiation. The two main techniques are symmetric encryption, which uses a shared secret key, and asymmetric encryption, which uses public and private key pairs. Common symmetric algorithms discussed are AES, DES, and Blowfish, while asymmetric algorithms include RSA and Diffie-Hellman key exchange. The goal of cryptography is to provide security services like confidentiality, integrity, authentication, non-repudiation, availability, and access control.
cryptography.ppt
This document discusses computer security and cryptography. It covers the basic needs and requirements of secure communication such as secrecy, authentication, and message integrity. It then describes the basics of cryptography including encryption algorithms, keys, symmetric and asymmetric encryption. Specific encryption algorithms covered include DES, Triple DES, Blowfish and AES. Cryptanalysis techniques for breaking encryption codes are also summarized. The document provides an overview of computer security and cryptography concepts.
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Cryptography
- 1. The history and art of cryptography 22.01.2013
- 2. • What is encryption? • Why would you use encryption? • How long has encryption been around?
- 4. Simple Steganography Plainly visible encrypted messages—no matter how unbreakable—will arouse suspicion Examples of Steganography – Wax tablets – Shaving Heads – Microdots – Any other suggestions (WWII)?
- 5. Transposition Moving plaintext characters to new locations in the text:
- 6. Simple Examples Transposition • Break into Teams – Try and Break/Crack This Message: Railfence Technique: BNOCDROOADNOEDJ
- 7. Subsititution Replacing plaintext characters with substitutes:
- 8. The Caeser Cypher In a Caeser cypher each letter of the alphabet is shifted along some number of places; Our message code is: This code was invented by Julius Caeser Move each letter on by three places of the alphabet: e.g. A→D B→ C→ M→
- 9. Caeser Cipher Split up into teams and try and identify the shift! BPQA PIA JMMV APQNBML JG MQOPB Speed up the decryption process: Plain A B C D E F G H … Cipher
- 10. Caeser Cypher Cont’d • If the cipher alphabet can be any rearrangement of the plain alphabet then there are - 400,000,000,000,000,000,000,000,000 combinations
- 11. Caeser Cipher • How to crack the Caeser cypher • Who plays Hangman? • Advantage codebreakers
- 12. Advantage Codemakers • The Vigenère cipher (1586) is a method of encrypting alphabetic text by using a series of different Caesar ciphers based on the letters of a keyword. • Key Difference is the use of a Keyword • Lets use the keyword ‘CAR’ and the paintext to be encrypted: ‘Its cold’
- 13. Vignere Cipher
- 14. Vignere Cipher • Break into teams • Select a key and write the message: • ‘Its not cold its freezing’ • Babbage versus Vignere: – Pattern analysis using variation of differing length in keywords
- 15. Summary so far: • A cipher (or cypher) is an algorithm for performing encryption and decryption — a series of well-defined steps that can be followed as a procedure. • In most cases, that procedure is varied depending on a key which changes the detailed operation of the algorithm. • The original information is known as plaintext, and the encrypted form as ciphertext.
- 16. The same techniques applied
- 17. The Age of the Machine and Mathematicians • DVD
- 18. Where we are today: • In the mid-1970s, strong encryption emerged from the sole preserve of secretive government agencies into the public domain, and is now used in protecting widely-used systems, such as Internet e- commerce, mobile telephone networks and bank automatic teller machines. • Encryption can be used to ensure secrecy, but other techniques are still needed to make communications secure, particularly to verify the integrity and authenticity of a message; for example, a message authentication code (MAC) or digital signatures.
- 19. SSL/TLS • The TLS protocol(s) allow applications to communicate across a network in a way designed to prevent eavesdropping, tampering, and message forgery. TLS provides endpoint authentication and communications privacy over a network using cryptography. Typically, only the server is authenticated (i.e., its identity is ensured) while the client remains unauthenticated; this means that the end user (whether an individual or an application, such as a Web browser) can be sure with whom they are communicating.
- 20. PKI • The next level of security - in which both ends of the "conversation" are sure with whom they are communicating - is known as mutual authentication. Mutual authentication requires public key infrastructure (PKI) deployment to clients. • Public key cryptography, also known as asymmetric cryptography, is a form of cryptography in which a user has a pair of cryptographic keys - a public key and a private key. The private key is kept secret, while the public key may be widely distributed. The keys are related mathematically, but the private key cannot be practically derived from the public key. A message encrypted with the public key can be decrypted only with the corresponding private key. The digital signature of the signer is verified using the public key. This verification process confirms that the message was not altered after the digital signature.
- 21. PKI
Editor's Notes
- Greeks RomansMary Scots Geneva – Sorting Offices renaissance –