By Sebastiaan Indesteege, Florian Mendel, Bart Preneel, Martin Schläffer (auth.), Michael J. Jacobson Jr., Vincent Rijmen, Reihaneh Safavi-Naini (eds.)
This quantity constitutes the chosen papers of the sixteenth Annual foreign Workshop on chosen parts in Cryptography, SAC 2009, held in Calgary, Alberta, Canada, in August 13-14 2009.
From a complete of ninety nine technical papers, 27 papers have been approved for presentation on the workshop. They conceal the subsequent issues: hash capabilities, on block and circulation ciphers, public key schemes, implementation, and privacy-enhancing cryptographic systems.
Read Online or Download Selected Areas in Cryptography: 16th Annual International Workshop, SAC 2009, Calgary, Alberta, Canada, August 13-14, 2009, Revised Selected Papers PDF
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Additional info for Selected Areas in Cryptography: 16th Annual International Workshop, SAC 2009, Calgary, Alberta, Canada, August 13-14, 2009, Revised Selected Papers
Mendel et al. Note that these two ﬁrst phases are doing essentially the same work as the rebound attack , but need fewer operations to complete (on average the rebound attack takes about one operations per valid candidate, but this whole step required 264 operations). 5 times to ﬁnd a solution, but compute only a few table lookups per iteration. Thus, we consider that we can ﬁnd one solution for the truncated diﬀerential path 1 → 8 → 64 → 8 with about one computation of Grøstl-256 on average.
AURORA-512 adopts a narrow-pipe mode of operation named DMMD, where two half-size (256-bit) chaining variables are updated independently by using the same message in each block. However, if all blocks are updated independently, the construction becomes vulnerable to Joux’s multi-collision attack . To prevent this attack, DMMD periodically computes the mixing function, which takes concatenation of two half-size chaining variables as input, to introduce the dependency of two chaining variables.
Note that an equivalent generic attack needs to ﬁnd a pair with only 4 active bytes at the input and output as well. Hence, the best generic method is to start with 4 active bytes at the input and search for a near-collision on 12 non-active bytes at the output with complexity 2(12·8)/2 = 248 . Using the linearized match-in-the-middle attack, we get a known-key distinguisher for 7-rounds of AES with a complexity of about 236 and negligible memory. However, the start-from-the-middle technique allows us to further improve the complexity for the known-key distinguisher to about 224 in time and negligible memory for 7-rounds of AES.