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Erschienen in:
2005 | OriginalPaper | Buchkapitel
A Failure-Friendly Design Principle for Hash Functions
verfasst von : Stefan Lucks
Erschienen in: Advances in Cryptology - ASIACRYPT 2005
Verlag: Springer Berlin Heidelberg
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This paper reconsiders the established Merkle-Damgård design principle for iterated hash functions. The internal state size
w
of an iterated
n
-bit hash function is treated as a security parameter of its own right. In a formal model, we show that increasing
w
quantifiably improves security against certain attacks, even if the compression function fails to be collision resistant. We propose the wide-pipe hash, internally using a
w
-bit compression function, and the double-pipe hash, with
w
=2
n
and an
n
-bit compression function used twice in parallel.