Titlebook: Selected Areas in Cryptography; 12th International W Bart Preneel,Stafford Tavares Conference proceedings 2006 Springer-Verlag Berlin Heide

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Impact of Rotations in SHA-1 and Related Hash Functionstiple sets of rotation constants, . the rotation amounts change with the step being processed..To our knowledge, no design rationales on the choice of rotation constants are given on any of these hash functions. This is the first paper that analyzes rotations in iterated hash functions. We focus on

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An Attack on CFB Mode Encryption as Used by OpenPGPor each block. Standard CFB mode encryption does not appear to be affected by this attack. It applies to a particular variation of CFB used by OpenPGP. In particular it exploits an ad-hoc integrity check feature in OpenPGP which was meant as a “quick check” to determine the correctness of the decrypting symmetric key.

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Tree-Based Key Distribution Patternsan reduce the upper bounds on the minimum number of rows of (.)-TKDPs, which are obtained from probabilistic methods, asymptotically by a factor of . as compared to Leighton and Micali’s schemes by choosing optimal trees . instead of chains.