Abstract
Recently Jakimoski and Kocarev cryptanalyzed two chaotic cryptosystems without using chaotic synchronization—Baptista cryptosystem and Alvarez cryptosystem. As a result, they pointed out that neither of the two cryptosystems are secure to known-plaintext attacks. In this Letter, we re-study the performance of Jakimoski–Kocarev attack on Baptista cryptosystem and find that it is not efficient enough as a practical attack tool. Furthermore, a simple but effective remedy is presented to resist Jakimoski–Kocarev attack, and the detailed discussion on its performance are given.
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