This paper reports a detailed cryptanalysis of a recently proposed encryption scheme based on the logistic map [A. Pisarchik et al., Chaos 16, 033118 (2006)]. Some problems are emphasized concerning the key space definition and the implementation of the cryptosystem using floating-point operations. It is also shown how it is possible to reduce considerably the key space through a ciphertext-only attack. Moreover, a timing attack allows for the estimation of part of the key due to the existent relationship between this part of the key and the encryption/decryption time. As a result, the main features of the cryptosystem do not satisfy the demands of secure communications. Some hints are offered to improve the cryptosystem under study according to those requirements. (C) 2008 American Institute of Physics.
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机译：本文报告了基于逻辑映射[A. Pisarchik et al。，Chaos 16，033118（2006）]。强调了一些有关密钥空间定义和使用浮点运算的密码系统实现的问题。还显示了如何通过仅密文攻击大大减少密钥空间。此外，由于密钥的这一部分与加密/解密时间之间存在关系，因此定时攻击允许估计密钥的一部分。结果，密码系统的主要特征不能满足安全通信的要求。根据这些要求，提供了一些提示来改进正在研究的密码系统。 （C）2008美国物理研究所。
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