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首页> 外文期刊>Designs, Codes and Cryptography >Provable security of block ciphers against linear cryptanalysis: a mission impossible? An experimental review of the practical security approach and the key equivalence hypothesis in linear cryptanalysis
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Provable security of block ciphers against linear cryptanalysis: a mission impossible? An experimental review of the practical security approach and the key equivalence hypothesis in linear cryptanalysis

机译：针对线性密码分析的分组密码可证明的安全性：不可能完成的任务吗？线性密码分析中的实用安全性方法和密钥等效假设的实验综述

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摘要

In this paper, we are concerned with the security of block ciphers against linear cryptanalysis and discuss the distance between the so-called practical security approach and the actual theoretical security provided by a given cipher. For this purpose, we present a number of illustrative experiments performed against small (i.e. computationally tractable) ciphers. We compare the linear probability of the best linear characteristic and the actual best linear probability (averaged over all keys). We also test the key equivalence hypothesis. Our experiments illustrate both that provable security against linear cryptanalysis is not achieved by present design strategies and the relevance of the practical security approach. Finally, we discuss the (im)possibility to derive actual design criteria from the intuitions underlined in these experiments.
机译：在本文中，我们关注针对线性密码分析的分组密码的安全性，并讨论了所谓的实际安全性方法与给定密码提供的实际理论安全性之间的距离。为此目的，我们提出了许多针对小型（即计算上易于处理的）密码的示例性实验。我们将最佳线性特征的线性概率与实际最佳线性概率（在所有键上平均）进行比较。我们还测试了关键等价假设。我们的实验表明，目前的设计策略无法实现针对线性密码分析的可证明安全性，以及实际安全性方法的相关性。最后，我们讨论了从这些实验所强调的直觉中得出实际设计标准的可能性。

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