University of Tartu - ©2011 Rafik Chaabouni - Last update: 05.12.2012 17:36
Date: 08/03/2012 Location: J. Liivi 2, room 317
Speaker: Wulf Harder
Title: Patterns in Input/Output-Dependencies of Block Ciphers and Arithmetic Operations
Abstract: Block ciphers show round independent, cipher specific patterns in the dependency matrix of input and output bits. The matrix is generated by using a large number of random plaintext/ciphertext pairs. When displaying these patterns in an image, they become weaker with an increasing number of rounds, but can be amplified by simple image processing functions like the contrast function. The matrices of the ciphers DES, AES, Blowfish, Twofish, Mars, IDEA™, RC5™, RC6™ and some arithmetic operations will be demonstrated.