The authors enumerate several defects in present day chaotic inverse system approaches, such as, the chaotic mapping may be reconstructed from a few plaintexts and their corresponding ciphertexts, and the self-synchronizing subsystem is so insensitive to its parameter mismatches that its parameters are generally not suitable for ciphers. Based upon Feldmann et al.'s model, we propose an enhanced model to overcome above problems. The new model is difficult to reconstruct and is sensitive to parameter mismatches, and the encrypted signal is shown to be uniformly distributed.
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