ABC (block cipher)

ABC (block cipher)

Infobox block cipher
name = ABC
designers = Dieter Schmidt
publish date = May 27 2002
derived from = MMB, SAFER
derived to =
related to =
certification =
key size = 512 bits
block size = 256 bits
structure = Substitution-permutation network
rounds = 17
cryptanalysis = In cryptography, ABC is a block cipher designed in 2002 by Dieter Schmidt.

ABC is a substitution-permutation network comprising 17 rounds with 3 different kinds of round functions. The first 8 rounds use XORs, modular multiplications as in MMB, and an expanded version of the pseudo-Hadamard transform (PHT) from SAFER. The middle round uses just XORs and multiplications. The final 8 rounds are similar to the first 8, but using the inverse PHT. ABC's block size of 256 bits and key size of 512 bits are both larger than in typical block cipher algorithms. The key schedule is very simple: 256-bit round keys are taken from the key, which is rotated by a fixed amount in each round.

References

* cite paper
author = Dieter Schmidt
title = ABC - A Block Cipher
date = May 27 2002
url = http://citeseer.ist.psu.edu/schmidt02abc.html
format = PDF/PostScript
accessdate = 2007-01-21


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