We analyze the security of chaotic optical communication using time-frequency (TF) representation. The mean scalogram ratio (MSR) of TF representation and peak sidelobe level of MSR are defined to detect message. Algorism for message detection and extraction is presented in detail. Two typical message encryption schemes chaos masking and chaos modulation are analyzed. The results show that it is not secure to transmit message when the message frequency locates at low power on power spectrum portrait. The proposed method is a useful tool to estimate the security level of message masking in chaotic optical communication.
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