Cryptology ePrint Archive: Report 2009/110

On the Security of Stream Cipher CryptMT v3

Haina Zhang and Xiaoyun Wang

Abstract: CryptMT v3 is a stream cipher submitted to eStream project, and has entered the third evaluation phase. Any attack has not been found until now. In this paper, we mainly discuss the security of the state initialization process of CryptMT v3. For the key and IV setup function $f_K$, we can construct a probabilistic testing algorithm $A^{f_K}$ with a distinguishing probability 1, which indicates that for each key $K$, $f_K$ is a non-PRF. However, we have not found any non-randomness about the keystream output.

Category / Keywords: secret-key cryptography / stream cipher, cryptanalysis, CryptMT v3

Date: received 7 Mar 2009

Contact author: hnzhang cn at gmail com, foxseazhn@sina com

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Version: 20090311:015309 (All versions of this report)

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