Cryptology ePrint Archive: Report 2008/353

Weaknesses in HENKOS Stream Cipher

Prasanth Kumar Thandra and S.A.V. Satya Murty and R Balasubramanian

Abstract: HENKOS is a synchronous stream cipher posted by Marius Oliver Gheorghita to eprint. In this paper we are going to present some weaknesses in the cipher. We first present a chosen IV attack which is very straight forward attack on the cipher. Second we present a group of weak keys.

Category / Keywords: secret-key cryptography / synchronous stream ciphers, weak keys/ related keys, chosen IV attack.

Date: received 13 Aug 2008

Contact author: prasanth at igcar gov in

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Version: 20080813:152612 (All versions of this report)

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