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Stream Ciphers Using a Random Update Function: Study of the Entropy of the Inner State

机译:使用随机更新函数的流密码:内在状态的熵的研究

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摘要

Replacing random permutations by random functions for the update of a stream cipher introduces the problem of entropy loss. To assess the security of such a design, we need to evaluate the entropy of the inner state. We propose a new approximation of the entropy for a limited number of iterations. Subsequently, we discuss two collision attacks which are based on the entropy loss. We provide a detailed analysis of the complexity of those two attacks as well as of a variant using distinguished points.
机译:用随机函数代替随机置换以更新流密码会引入熵损失的问题。为了评估这种设计的安全性,我们需要评估内部状态的熵。我们为有限数量的迭代提出了新的熵近似值。随后,我们讨论了两种基于熵损失的碰撞攻击。我们对这两种攻击的复杂性以及使用不同点的变体进行了详细分析。

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