In this paper, we first experimentally demonstrate a novel cellular neural network (CNN)-based physical layer encryption scheme to achieve the capability of chosen-plaintext attacks (CPAs) resistance and time synchronization simultaneously in orthogonal frequency division multiplexing passive optical network (OFDM-PON). By utilizing the hyperchaotic phenomena within a certain parameter range characteristics of CNN, a four-dimensional (4-D) CNN-based system is constructed to strengthen the security of data transmission. And, according to CNN, the chaotic Feistel transform is executed after extracting the indexes of QAM data, in which completely dynamic encrypted data can be achieved for the CPAs resistance. Moreover, a chaotic training sequence generated by CNN used as timing sequence is added to the transmitted OFDM signals to obtain time synchronization and further increasing the confidentiality of the encryption system. A verified experimental system with 10-Gb/s 16-QAM encrypted OFDM signals through 20-km single-mode fiber (SMF) transmission is conducted. And, the results show that the Feistel and CNN-based physical-layer encryption scheme can generate completely dynamic ciphertexts for the CPAs resistance and accurately realize the time synchronization, and without apparent receiver sensitivity deterioration (∼0.3dB) is introduced in comparison with other against CPAs schemes. INDEX TERMS Cellular neural network (CNN) encryption, orthogonal frequency division multiplexing (OFDM), passive optical network (PON), dynamic ciphertexts.
In this paper, we propose a dynamic key technique based on Cellular Neural Network (CNN) for security improvement in the orthogonal frequency division multiplexing passive optical network (OFDM-PON). To enhance the encryption scheme security, a six-dimensional CNN hyperchaotic system is employed to encrypt the data. And, the keys are divided into the dynamic and static. The dynamic key is randomly extracted from a key set by incorporating the random feature of the input data. Then, the chaotic sequence generated by the dynamic key is served as the synchronous sequence for encryption. Moreover, the chaotic sequences generated by the static keys are used to resist the chosen-plaintext attacks (CPAs) and scramble the phase of QAM symbols on the frequency domain. With these processing techniques, the multi-fold data encryption can create a key space of ~10 315 to protect against the exhaustive trial. The transmission of 10-Gb/s encrypted 16-QAM-based OFDM signal is demonstrated over 20-km single mode fiber (SMF) by experiment. The results show that our proposed scheme can provide excellent confidentiality of data transmission against the CPAs and brute-force attack.
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