On 2013-08-17 at 20:52 +0000, Edward Ned Harvey (lopser) wrote: > Does anybody have a copy of Cryptography Engineering?
Yes; 2nd Ed, 2010, as an ePub, purchased from O'Reilly. http://shop.oreilly.com/product/9780470474242.do > There's a specific question I wanted to look up. I seem to recall, if > you want a block cipher to withstand 2^128 operations, you actually > need 256 bits in the key. I'm looking for clarification, if I'm > remembering correctly, or not. Sanity check. 3.5.7 What Key Size Should I Use? Their cited rationale is collision attacks and safety margin, especially in the context of known weaknesses in AES. Collision attacks are also the reason for the suggested doubling of bit-count for hash functions. You might want: http://en.wikipedia.org/wiki/Birthday_attack http://en.wikipedia.org/wiki/Meet-in-the-middle_attack -Phil _______________________________________________ Tech mailing list [email protected] https://lists.lopsa.org/cgi-bin/mailman/listinfo/tech This list provided by the League of Professional System Administrators http://lopsa.org/
