Recently, an encryption algorithm based on two-dimensional discretized chaotic maps was proposed [Xiang et al., Phys. Lett. A 364 (2007) 252]. In this Letter, we analyze the security weaknesses of the proposal. Using the algebraic dependencies among system parameters. we show that its effective key space can be shrunk. We demonstrate a chosen-ciphertext attack that reveals a portion of the key.
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机译：最近，提出了一种基于二维离散混沌图的加密算法[Xiang et al。，Phys。来吧A 364（2007）252]。在这封信中，我们分析了该提案的安全性弱点。使用系统参数之间的代数依赖关系。我们表明其有效密钥空间可以缩小。我们演示了一种选择密文攻击，该攻击揭示了一部分密钥。
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