Intelligent pseudo-random number mapping/coding to enhance optical CDMA network security

A novel method with M-sequence code in optical code-division multiple-access (OCDMA) network, called pseudo-random number mapping/coding (PRNMC) algorithm, includes chaos equation, HCC/EHCC algorithm, two mapping methods. An approximately symmetric scheme is used to transmit and receive the secret key in private channel from encoder to decoder. By combining those algorithms appropriately, the security of network is increased and reduces the probability of eavesdropping of codeword.