Cryptography
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The document discusses cryptography and its key components. Cryptography is the conversion of data into a secret code for transmission over a public network. It involves encrypting plaintext into ciphertext using an encryption algorithm and key. There are two main types of cryptographic algorithms - symmetric key encryption which uses a single shared key for encryption and decryption, and asymmetric key encryption which uses separate public and private keys. Asymmetric key encryption allows anyone to encrypt messages using the public key, but only the holder of the private key can decrypt them.
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F16 cs61 cryptography
Cryptography is the study of securing communication and information. It uses protocols, algorithms, and strategies to hide sensitive information from unauthorized access and enable verification of every component of a communication. The primary functions of cryptography are privacy, authentication, integrity, non-repudiation, and key exchange. While cryptography provides advantages in security and verification, it also has limitations such as vulnerability to brute force attacks and risk of losing access to data if secret keys are lost.
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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.
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This document discusses the importance of cryptography and PKI for ensuring security, privacy, and authentication in digital communications. It addresses the three main goals of cryptography - confidentiality, integrity, and availability. The document then provides an overview of cryptographic algorithms, including symmetric and asymmetric encryption as well as hash functions. It also discusses common cryptanalytic attacks and how the strength of encryption increases exponentially with longer key sizes, making brute-force attacks infeasible for sufficiently long keys.
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Cryptography is used to protect information by encrypting messages into an unreadable cipher text format. Modern cryptography uses either secret key cryptography, which uses a single key for encryption and decryption, or public key cryptography, which uses two mathematically related keys with one key to encrypt and the other to decrypt. The purpose of cryptography and security is to defend against hackers, industrial espionage, and to secure e-commerce, bank accounts, intellectual property, and avoid liability.
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Encryption is the process of encoding messages or information so that only authorized parties can read it. There are two main types of encryption: symmetric key encryption which uses the same key to encrypt and decrypt, and asymmetric key encryption which uses a public key to encrypt and a private key to decrypt. While symmetric encryption is faster, asymmetric encryption is more secure since it does not require sharing the same key. Encryption is widely used to provide authentication, privacy, integrity, and accountability of data.
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Cryptography is the study of securing communication and information. It uses protocols, algorithms, and strategies to hide sensitive information from unauthorized access and enable verification of every component of a communication. The primary functions of cryptography are privacy, authentication, integrity, non-repudiation, and key exchange. While cryptography provides advantages in security and verification, it also has limitations such as vulnerability to brute force attacks and risk of losing access to data if secret keys are lost.
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Encryption is a fundamental concept in cryptography that involves the process of converting plaintext (readable and understandable data) into ciphertext (encoded and unintelligible data) using a mathematical algorithm and an encryption key. The primary purpose of encryption is to ensure the confidentiality and privacy of sensitive information during transmission or storage.
In the encryption process:
1. **Plaintext:** This is the original, readable data that is to be protected. It could be a message, a file, or any form of digital information.
2. **Encryption Algorithm:** An encryption algorithm is a set of mathematical rules and procedures that transform the plaintext into ciphertext. Common encryption algorithms include Advanced Encryption Standard (AES), RSA, and Triple DES.
3. **Encryption Key:** The encryption key is a piece of information used by the encryption algorithm to perform the transformation. The key determines the specific pattern and method by which the plaintext is converted into ciphertext. The strength of the encryption often depends on the length and randomness of the key.
4. **Ciphertext:** This is the result of the encryption process—the transformed and encoded data that appears random and is indecipherable without the corresponding decryption key.
Encryption serves several important purposes in the field of cryptography:
- **Confidentiality:** The primary goal of encryption is to keep information confidential and secure from unauthorized access. Even if an unauthorized party intercepts the ciphertext, they should be unable to understand or decipher it without the correct decryption key.
- **Integrity:** Encryption helps ensure the integrity of data by providing a means to detect any unauthorized modifications. If the ciphertext is altered, the decryption process will produce incorrect results, alerting the recipient to potential tampering.
- **Authentication:** In some encryption scenarios, the use of digital signatures or authenticated encryption helps verify the origin and authenticity of the encrypted data.
- **Secure Communication:** Encryption is widely used to secure communication over networks, such as the internet. Protocols like HTTPS (HTTP Secure) use encryption to protect the confidentiality of data transmitted between a web browser and a web server.
- **Data-at-Rest Protection:** Encryption is applied to data stored on devices or servers, ensuring that even if physical access is gained, the data remains protected from unauthorized viewing.
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The document presents information on cryptography by Riddhi Gupta at Sophia Girls' College in Ajmer, India. It defines cryptography as the practice of hiding information to provide confidentiality, integrity, and accuracy. The purposes of cryptography are discussed, including authentication, privacy, integrity, and non-repudiation. Cryptography supports these security aims to provide privacy of information and prevent alteration. The document outlines the architecture and types of cryptography, including secret key cryptography and public key cryptography. It describes the process of cryptography and concludes that different algorithms are used to establish security services.
Cryptography full report
This document discusses cryptography and network security. Cryptography is defined as the science of protecting data by converting it into an unreadable format. The goals of cryptography are confidentiality, authentication, integrity, and non-repudiation. The document outlines common cryptographic techniques like encryption, decryption, hashes, and digital signatures. It also discusses security threats to network communication like interception, modification, and repudiation. The importance of network security is growing as more applications move to distributed models and operate over the internet.
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.
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.
What is digital signature or DSC
The document discusses digital signatures and public key infrastructure (PKI) for building trust in online transactions. It explains symmetric and asymmetric encryption techniques, including how public key encryption works using key pairs to ensure authentication, confidentiality, integrity and non-repudiation. Digital signatures encrypt a hash of a message with the sender's private key to verify authenticity and integrity without revealing the original message. A PKI uses digital certificates issued by a certificate authority to associate users with their public keys.
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.
Vtu network security(10 ec832) unit 2 notes..
UNIT - 2
SYMMETRIC CIPHERS: Symmetric Cipher Model, Substitution Techniques,
Transposition Techniques, Simplified DES, Data encryption standard (DES), The strength of
DES, Differential and Linear Cryptanalysis, Block Cipher Design Principles and Modes of
Operation, Evaluation Criteria for Advanced Encryption Standard, The AES Cipher.
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Cryptography
- 1. Presented By:- Akshay Ingole Date:- 21-2-2019 Cryptography (κρυπτογράφηση) S.S.S.K.R. INNANI MAHAVIDYALYA
- 2. WHAT IS CRYPTOGRAPHY ? The conversion of data into a secret code for transmission over a public network. The original text ("plaintext") is turned into a coded equivalent called "ciphertext" via an encryption algorithm.
- 3. COMPONENTS OF A CRYPTOSYSTEM Plaintext:- the message before encryption. Ciphertext:- the message after encryption. Key:-information needed to convert from plain text to cipher text (or vice-versa). Function: the encryption or decryption algorithm used, to encrypt or decrypt message.
- 4. SECURITY REQUIREMENTS Encryption / decryption: transforming data into something an attacker cannot understand and vice-versa. Authentication: ensures that sender and receiver are who they are claiming to be Data integrity: ensure that data is not changed from source to destination Confidentiality: ensures that data is read only by authorized users
- 5. TYPES OF CRYPTOGRAPHIC ALGORITHM There are two types of cryptosystems based on the manner in which encryption-decryption is carried out in the system − Symmetric Key Encryption Asymmetric Key Encryption
- 6. SYMMETRIC KEY ENCRYPTION Uses a single key for both encryption and decryption; also called private encryption. Key is shared by both sender and receiver. Both the sender and the receiver use the same secret keys.
- 7. ASYMMETRIC KEY ENCRYPTION Uses one key for encryption and another for decryption; also called public encryption. asymmetric cryptography involves the use of two keys: a public-key, which may be known by anybody, and can be used to encrypt messages. a private-key, known only to the recipient, used to decrypt messages,. is asymmetric because those who encrypt messages or verify signatures cannot decrypt messages or create signatures