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On non-negligible bias of the first output byte of RC4 towards the first three bytes of the secret key

机译:RC4的第一个输出字节对密钥的前三个字节的偏差不可忽略

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摘要

In this paper, we show that the first byte of the keystream output of RC4 has non-negligible bias towards the sum of the first three bytes of the secret key. This result is based on our observation that the index, where the first byte of the keystream output is chosen from, is approximately twice more likely to be 2 than any other value. Our technique is further used to theoretically prove Roos's experimental observation (A class of weak keys in the RC4 stream cipher, 1995) related to weak keys.
机译:在本文中,我们表明RC4密钥流输出的第一个字节对秘密密钥的前三个字节之和具有不可忽略的偏差。此结果基于我们的观察结果,即从中选择密钥流输出的第一个字节的索引比其他任何值大2的可能性大约是其两倍。我们的技术被进一步用于从理论上证明Roos与弱密钥相关的实验观察(RC4流密码中的一类弱密钥,1995)。

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