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An Analysis of the Hermes8 Stream Ciphers

By Steve Babbage, Carlos Cid, Norbert Pramstaller and Havard Raddum


Hermes8 [6,7] is one of the stream ciphers submitted to the ECRYPT Stream Cipher Project (eSTREAM [3]). 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

Topics: 080402 Data Encryption, Hermes8, Stream Cipher, Cryptanalysis
Publisher: Springer
Year: 2007
DOI identifier: 10.1007/978-3-540-73458-1_1
OAI identifier:

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