Cryptology ePrint Archive: Report 2006/269

An Analysis of the Hermes8 Stream Ciphers

Steve Babbage and Carlos Cid and Norbert Pramstaller and Havard Raddum

Abstract: Hermes8 is one of the stream ciphers submitted to the ECRYPT Stream Cipher Project (eSTREAM). In this paper we present an analysis of the Hermes8 stream ciphers. In particular, we show an attack on the latest version of the cipher (Hermes8F), which requires very few known keystream bytes and recovers the cipher secret key in less than a second on a normal PC. Furthermore, we make some remarks on the cipher's key schedule and discuss some properties of ciphers with similar algebraic structure to Hermes8.

Category / Keywords: Hermes8, Stream Cipher, Cryptanalysis.

Publication Info: Presented at ACISP 2007.

Date: received 11 Aug 2006, last revised 28 Jun 2007

Contact author: carlos cid at rhul ac uk

Available format(s): Postscript (PS) | Compressed Postscript (PS.GZ) | PDF | BibTeX Citation

Note: Updated version presented at ACISP 2007.

Version: 20070628:160811 (All versions of this report)

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