Computer Science – Cryptography and Security
Scientific paper
2004-02-02
Physics Letters A, 332(5-6):368-375, 2004
Computer Science
Cryptography and Security
13 pages, 2 figures
Scientific paper
10.1016/j.physleta.2004.09.028
In 1998, M. S. Baptista proposed a chaotic cryptosystem, which has attracted much attention from the chaotic cryptography community: some of its modifications and also attacks have been reported in recent years. In [Phys. Lett. A 307 (2003) 22], we suggested a method to enhance the security of Baptista-type cryptosystem, which can successfully resist all proposed attacks. However, the enhanced Baptista-type cryptosystem has a nontrivial defect, which produces errors in the decrypted data with a generally small but nonzero probability, and the consequent error propagation exists. In this Letter, we analyze this defect and discuss how to rectify it. In addition, we point out some newly-found problems existing in all Baptista-type cryptosystems and consequently propose corresponding countermeasures.
Cai Yuanlong
Chen Guanrong
Li Shujun
Mou Xuanqin
Wong Kwok-Wo
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