title: Comment on "On the security of a spatiotemporal chaotic cryptosystem" [Chaos 17, 033117 (2007)].
abstract: This paper comments on a recent paper by R. Rhouma and B. Safya [Chaos 17, 033117 (2007)]. They claimed to find some security weakness of the spatiotemporal chaotic cryptosystem suggested by G. Tang et al. [Phys. Lett. A 318, 388 (2003)] and proposed a chosen-plaintext attack to analyze this system. We find that in their analysis, called a "chosen-plaintext attack," they actually act as a legal receiver (with a machine in their hands during the entire decryption process) rather than an attacker and, therefore, the whole reasoning is not valid.
authors.affiliation: School of Sciences, Key Laboratory of Optical Communication and Lightwave, Beijing University of Posts and Telecommunications, Beijing 100876, China.
authors.forename: Shihong
authors.initials: S
authors.lastname: Wang
authors.forename: Gang
authors.initials: G
authors.lastname: Hu
mesh_terms: D000465:Algorithms; D016494:Computer Security; D003198:Computer Simulation; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D016247:Information Storage and Retrieval / Q000379:methods*; D008962:Models, Theoretical; D017711:Nonlinear Dynamics; D012815:Signal Processing, Computer-Assisted