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Erschienen in:
2011 | OriginalPaper | Buchkapitel
The Collision Security of Tandem-DM in the Ideal Cipher Model
verfasst von : Jooyoung Lee, Martijn Stam, John Steinberger
Erschienen in: Advances in Cryptology – CRYPTO 2011
Verlag: Springer Berlin Heidelberg
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We prove that Tandem-DM, which is one of the two “classical” schemes for turning a blockcipher of 2
n
-bit key into a double block length hash function, has birthday-type collision resistance in the ideal cipher model. A collision resistance analysis for Tandem-DM achieving a similar birthday-type bound was already proposed by Fleischmann, Gorski and Lucks at FSE 2009 [3]. As we detail, however, the latter analysis is wrong, thus leaving the collision resistance of Tandem-DM as an open problem until now. Our analysis exhibits a novel feature in that we introduce a trick not used before in ideal cipher proofs.