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Cryptanalysis of Mir-1: A T-Function-Based Stream Cipher

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4 Author(s)
Tsunoo, Y. ; NEC Corp., Kanagawa ; Saito, T. ; Kubo, H. ; Suzaki, T.

This correspondence describes the cryptanalysis of Mir-1, a T-function based stream cipher proposed at eSTREAM (the ECRYPT Stream Cipher Project) in 2005. This cipher uses a multiword T-function, with four 64-bit words, as its basic structure. Mir-1 operations process the data in every 64 bits (one word) to generate a keystream. The correspondence discusses a distinguishing attack against Mir-1 that exploits the T-function characteristics and the Mir-1 initialization. With merely three or four initial vector pairs, this attack can distinguish a Mir-1 output sequence from a truly random number sequence. In this case, the amount of data theoretically needed for cryptanalysis is only 210 words. This correspondence also proposes a countermeasure that provides resistance against the attack described in this correspondence.

Published in:

Information Theory, IEEE Transactions on  (Volume:53 ,  Issue: 11 )

Date of Publication:

Nov. 2007

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