Cryptography intro
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Cryptography involves encrypting plaintext data into ciphertext using encryption algorithms and keys. Conventional cryptography uses a single secret key for both encryption and decryption, while public key cryptography uses separate public and private keys. The combination of these methods in hybrid cryptosystems like PGP provides both the speed of conventional encryption and the key distribution benefits of public key cryptography.
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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.
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Symmetric key encryption uses a secret key that is shared between two computers to encrypt and decrypt messages sent between them. Public key encryption addresses the weakness of needing to securely share a key beforehand by using a hashing algorithm to generate keys from input values, making it nearly impossible to derive the original input without knowing the data used to create the hash. A popular implementation of public key encryption is Secure Sockets Layer (SSL) and its successor Transport Layer Security (TLS), which are Internet security protocols used by browsers and servers to transmit sensitive information securely.
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This document discusses secret key cryptography. Secret key cryptography uses the same key to encrypt and decrypt messages. It provides examples of simple substitution ciphers and discusses algorithms like AES, 3DES, and RC4. The document outlines the uses of secret key cryptography for secure communication when both parties have the shared key. It also discusses the advantages of speed and disadvantages of needing to keep the shared key secret.
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Cryptography ppt
The internet is the internationally connected network of computer networks with addresses that are administrated by IANA
Cryptography
The document provides information about the members of a group - Abdullah Rashid Baig, Adnan Haider, Muhammad Zakria, and Muhammad Zeeshan Khan. It then provides definitions and explanations of cryptography, cryptographic algorithms, encryption, decryption, plaintext, ciphertext, keys, secret key cryptography, public key cryptography, hashing, digital signatures, and security goals like confidentiality, authentication, integrity, availability, non-repudiation, and access control. It also discusses potential attacks on cryptography like viruses, traffic analysis, electromagnetic detection, and dictionary attacks.
Evolution of Cryptography and Cryptographic techniques
1) Cryptography originated from the inherent human needs to communicate selectively and share information privately.
2) Early forms of cryptography included hieroglyphs and cipher techniques used by ancient Egyptian and Roman civilizations.
3) Modern cryptography is based on mathematical concepts from fields like number theory and uses algorithms like symmetric encryption, asymmetric encryption, hashing, and steganography to provide security services like confidentiality, integrity, authentication, and non-repudiation.
PresentationonCRYPTOGRAPHYppt.ppt - Read-Only - Compatibility Mode.ppt
This document provides an overview of cryptography. It defines cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. The document outlines the basic architecture of cryptography, including secret key cryptography, public key cryptography, hash functions, and types of cryptographic attacks. It describes the processes of public/private key cryptography and different types of cryptographic algorithms.
Fundamentals of cryptography
Introduction to Cryptography, Fundamentals of cryptography, Encryption, Decryption, Plaintext, Ciphertext, Public key cryptography, Secret key cryptography, steam cipher, block cipher, transposition cipher, security of cryptographic algorithm, cipher attack,
CRYPTOGRAPHY-PAYAL CHOPRA.ppt
This document provides an overview of cryptography. Cryptography is the practice of hiding information to ensure confidentiality, integrity, and authentication. There are two main types: secret key cryptography which uses a single key for encryption and decryption, and public key cryptography which uses separate public and private keys. Popular cryptographic algorithms include RSA and hash functions. Cryptography aims to provide security against common attacks such as ciphertext-only attacks.
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.
Sw2
Encryption works by using keys to scramble private information before it is transmitted online. There are two main types of encryption: symmetric key encryption which uses a shared secret key between two parties, and public key encryption which uses different keys for encryption and decryption allowing for more secure communication without sharing secrets. Popular implementations of public key encryption include Secure Sockets Layer (SSL) and Transport Layer Security (TLS) protocols which encrypt web traffic to transmit sensitive information securely. Hashing algorithms also play a key role in encryption by generating hash values from inputs that are nearly impossible to reverse without the original data.
PresentationonCRYPTOGRAPHYppt.ppt
This document provides an overview of cryptography. It begins with defining cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. It then describes the basic architecture and types of cryptography, including secret key cryptography, public key cryptography, and hash functions. The document outlines the process of cryptography and different algorithm types, including public/private key cryptography and hash functions. It concludes by discussing different types of attacks on cryptography and thanking the audience.
PresentationonCRYPTOGRAPHYppt.ppt
This document provides an overview of cryptography. It begins with defining cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. It then describes the basic architecture and types of cryptography, including secret key cryptography, public key cryptography, and hash functions. The document outlines the process of cryptography and different algorithm types, including public/private key cryptography and hash functions. It concludes by discussing different types of attacks on cryptography and thanking the audience.
Presentationon ON THE TOPIC CRYPTOGRAPHY
This document provides an overview of cryptography. It begins with defining cryptography as the practice of hiding information and discusses its purposes, including authentication, privacy, integrity, and non-repudiation. It then describes the basic architecture and types of cryptography, including secret key cryptography, public key cryptography, and hash functions. The document outlines the process of cryptography and different algorithm types, including public/private key cryptography and hash functions. It concludes by discussing different types of attacks on cryptography and thanking the audience.
Overview of cryptography
This document provides an overview of cryptography. It discusses that cryptography is the practice of secure communication in the presence of others. The purpose of cryptography is to defend against hackers and industrial espionage while securing e-commerce, bank accounts, intellectual property, and avoiding liability. Cryptography provides authentication, privacy, integrity, and non-repudiation. Encryption converts plain text to cipher text using a key while decryption converts cipher text to plain text. Common cryptographic algorithms are secret key cryptography, public key cryptography, and hash functions. Secret key cryptography uses a private key for encryption while public key cryptography uses a public key exchanged over an insecure channel. Hash functions produce a checksum of data. AES encryption is now commonly used and
Data encryption
Encryption is a technique that scrambles data to make it unreadable by anyone without access to the decryption key. There are different types of encryption methods, including hashing, symmetric encryption (using a single private key), and asymmetric encryption (using a public and private key pair). Common encryption algorithms include Triple DES, RSA, Blowfish, Twofish, and AES. The future of encryption involves new techniques like honey encryption and quantum key distribution to stay ahead of evolving cyber threats.
Ch12 Encryption
Encryption obscures information to authorize access while hiding it from others. Private key encryption uses a shared key while public key encryption uses separate keys for encryption and decryption. Digital signatures authenticate information through encryption with a private key. Key management creates, distributes, certifies, protects, and revokes keys, while hierarchical and web of trust models establish trust in encryption systems.
Cryptography
Cryptography is used to securely communicate private information and can be implemented using secret codes, ciphers, one-time pads, and cryptographic methods like symmetric and asymmetric encryption. Pretty Good Privacy (PGP) is an encryption package that uses asymmetric encryption with two keys - a private key and a public key. A message encrypted with the public key can only be decrypted with the corresponding private key, allowing secure communication between parties. PGP first compresses, encrypts with a randomly generated session key, and then encrypts the session key with the recipient's public key to securely transmit an encrypted message.
Security - ch3.pptx
Cryptography involves encrypting messages to provide security services like confidentiality and integrity. It uses techniques like symmetric encryption with secret keys, asymmetric encryption with public/private key pairs, digital signatures, and hash functions. The document discusses specific cryptographic algorithms and how they work, including the Data Encryption Standard (DES), Triple DES, the Advanced Encryption Standard (AES), and the Rivest-Shamir-Adelman (RSA) public-key algorithm. Cryptography is important for securely storing, transmitting, and authenticating digital information.
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Secret-Key-Cryptography-ppt-by-alljobs.co_.in_.pptx
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Evolution of Cryptography and Cryptographic techniques
Evolution of Cryptography and Cryptographic techniques
PresentationonCRYPTOGRAPHYppt.ppt - Read-Only - Compatibility Mode.ppt
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Cryptography intro
- 1. Cryptography An Introduction