Cryptology ePrint Archive: Report 2005/398

Preliminary Analysis of DHA-256

IAIK Krypto Group

Abstract: DHA-256 was presented at the Cryptographic Hash Workshop hosted by NIST in November 2005. DHA-256 (Double Hash Algorithm) was proposed to enhance the security of SHA-256. We present a preliminary analysis of the message expansion and give an alternative 9-step local collision for DHA-256.

Category / Keywords: hash functions

Date: received 4 Nov 2005, last revised 7 Nov 2005

Contact author: Norbert Pramstaller at iaik tugraz at

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Version: 20051107:090108 (All versions of this report)

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