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EUROCRYPT
2009
Springer

Cryptanalysis of MDC-2

15 years 3 days ago
Cryptanalysis of MDC-2
We provide a collision attack and preimage attacks on the MDC-2 construction, which is a method (dating back to 1988) of turning an n-bit block cipher into a 2n-bit hash function. The collision attack is the first below the birthday bound to be described for MDC-2 and, with n = 128, it has complexity 2124.5 , which is to be compared to the birthday attack having complexity 2128 . The preimage attacks constitute new time/memory trade-offs; the most efficient attack requires time and space about 2n , which is to be compared to the previous best known preimage attack of Lai and Massey (Eurocrypt '92), having time complexity 23n/2 and space complexity 2n/2 , and to a brute force preimage attack having complexity 22n .
Christian Rechberger, Florian Mendel, Lars R. Knud
Added 24 Nov 2009
Updated 24 Nov 2009
Type Conference
Year 2009
Where EUROCRYPT
Authors Christian Rechberger, Florian Mendel, Lars R. Knudsen, Søren S. Thomsen
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