Cryptanalysis of a cryptosystem based on discretized two-dimensional chaotic maps
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CitationSolak, E. & Çokal, C. (2008). Cryptanalysis of a cryptosystem based on discretized two-dimensional chaotic maps. Physics Letters A, 372(46), 6922-6924. doi:10.1016/j.physleta.2008.10.022
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.