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A Distinguishing Attack on a Fast Software-Implemented RC4-Like Stream Cipher

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4 Author(s)
Tsunoo, Y. ; NEC Corp. 1753, Kanagawa ; Saito, T. ; Kubo, H. ; Suzaki, T.

In 2005, Gong proposed an RC4-like stream cipher capable of fast operation on a 32/64-bit processor. This stream cipher solved the RC4 problem of difficult 32/64-bit processing, a problem once thought impossible to solve. Operation of the cipher on 32- and 64-bit processors is about 3.1 and 6.2 times as fast, respectively, as that of the RC4 cipher. However, we have found a considerable bias in the output sequence of the RC4-like stream cipher. Using the bias along with the first two words of a keystream associated with approximately 230 secret keys allows us to build a distinguisher.

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Information Theory, IEEE Transactions on  (Volume:53 ,  Issue: 9 )