'Polyalphabetic substitution cipher' diaporamas de présentation

CSCD 303 Fall 2018

CSCD 303 Fall 2018. Lecture 18 Cryptography - Basics. Cryptography. Introduction Cryptography is a science For exchanging information between intended recipients Has been used for over 4000 years What is the main use of Crytography today? Cryptography used for Data integrity

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Cryptography and Network Security

Cryptography and Network Security. Sixth Edition by William Stallings . Chapter 2. Classical Encryption Techniques.

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Computer Security

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introduction to cryptography by konrad

introduction to cryptography by konrad. Introduction to cryptography. Cryptography is the process of encrypting/decrypting data streams using some E(M)/D(M) methods. E == encryption function D == decryption function M == message C == cipher text encrypted. Encryption function.

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Introduction to Information Security Chapter II : Classical Ciphers

Introduction to Information Security Chapter II : Classical Ciphers. Contents. History of cryptographic research Substitution ciphers Caesar ciphers Affine ciphers Monoalphabetic substitution cipher Homophonic substitution cipher Polyalphabetic substitution cipher Vigenere cipher

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Monoalphabetic and Polyalphabetic Ciphers

Monoalphabetic and Polyalphabetic Ciphers. Monoalphabetic - only one substitution/ transposition is used Polyalphabetic - where several substitutions/ transpositions are used Several such ciphers may be concatenated together to form a Product Cipher.

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Monoalphabetic and Polyalphabetic Ciphers

Monoalphabetic and Polyalphabetic Ciphers. Monoalphabetic - only one substitution/ transposition is used Polyalphabetic - where several substitutions/ transpositions are used Several such ciphers may be concatenated together to form a Product Cipher.

312 views • 8 slides