'Known plaintext attack' diaporamas de présentation

Computer Security Set of slides 3

489 views • 36 slides

Computer and Information Security

Computer and Information Security. Chapter 6 Advanced Cryptanalysis. Chapter 6: Advanced Cryptanalysis. For there is nothing covered, that shall not be revealed; neither hid, that shall not be known. ? Luke 12:2. The magic words are squeamish ossifrage

526 views • 34 slides

Chap 1: Introduction

Chap 1: Introduction. Some background The message is usually represented as M or P (plaintext), the encryption result is usually represented as C (ciphertext). C usually has the same length as M or even longer E(M) = C, D(C) = M D(E(M)) = M

358 views • 28 slides

A Cryptography Tutorial

A Cryptography Tutorial. Jim Xu College of Computing Georgia Tech http://www.cc.gatech.edu/~jx. Why Cryptography?. Network information needs to be communicated through insecure channel. Stored information may be accessed without proper authorization.

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Cryptanalysis

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Chapter 2 Basic Encryption and Decryption (part B)

Chapter 2 Basic Encryption and Decryption (part B). 2.4 Transpositions (Permutations). P.47 Transposition: an encryption in which the letters of the message are rearranged Also known as permutations Compare the goals: Substitution ? confusion Transposition ? diffusion.

363 views • 17 slides