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Cryptanalysis of an Image Cipher using Multi entropy Measures and the Countermeasures

机译：使用多熵措施和对策的图像密码分析及对策

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The use of same keys or equivalent keys should not be occurred in cryptographic communications because a cipher system utilising such keys to secure messages can be attacked even it possesses excellent cryptographic characteristics for extracting intelligible information from encrypted messages. Identification of crypts formed with such keys is an important task of traffic analysis of cryptographic communications to check the applicability of two-messages-on-same-key (TMSK) attack. To avoid its applicability, adequate safeguards are required. In the paper, we cryptanalyze stream encryption based cipher system and propose an intelligent identification methodology using multi-entropy measures and soft decision criteria for identification of encrypted images of same or equivalent keys. Experimental test results show that the crypts formed with same keys can be identified successfully with high precision. We also present the countermeasures against TMSK attack.
机译：在加密通信中不应发生相同的密钥或等效键，因为利用这种密钥的密码系统甚至可以攻击用于从加密消息中提取可理解信息的优异的加密特性。用这种键形成的隐窝识别是加密通信的交通分析的重要任务，以检查两个消息与相同键（TMSK）攻击的适用性。为避免其适用性，需要充分的保障措施。在论文中，我们密码基于流加密的密码系统，并使用多熵测量和软判定标准提出智能识别方法，用于识别相同的加密图像或等效键。实验测试结果表明，用相同键形成的隐窝可以高精度成功识别。我们还提出了针对TMSK攻击的对策。

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