Security issues based on chaotic systems

A new encryption algorithm based on subblock processing in which one-way mixing functions obtained from a dynamic chaotic system, is presented and analyzed. The algorithm is based on an expansion of the Feistel cipher scheme, where the round function operates on a more grained subblock and both the key generations and the round functions are obtained from the quantized trajectory of chaotic systems. The paper gives details on the algorithm implementation and proposes a differential cryptanalysis investigation showing the algorithm robustness as a function of the used chaotic map. A final comparison with DES-like cryptosystem shows the effectiveness of our proposal in terms of minimum number of steps required to break the system.