Enhanced Physical Layer Security Based on Joint Encryption of Similar Polarization State Rotation Perturbations and 6-D Hyperchaotic Scrambling for Polarization Division Multiplexing System

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ABSTRACT The paper proposes an optical physical layer encryption scheme based on the combination of similar rotation of the state of polarization (SRSOP) and a six-dimensional (6D) hyperchaotic system. By introducing similar polarization state rotation to disturb vector data at the transmitting end, the security of optical transmission systems can be effectively enhanced. In addition, the data perturbation of polarization state rotation, combined with the 6D hyperchaotic system with unpredictability and sensitivity, can extend the key space of the encryption scheme to 10180, making it resistant to brute force attacks. The encryption process of this scheme is as follows: Firstly, the chaotic sequences generated by the 6D hyperchaotic system were used to encrypt various parameters in the polarization encryption matrix, and then these parameters were used to generate the corresponding polarization encryption matrix. Finally, the encryption matrix was used to perturb the data to be sent. The scheme was successfully tested on a polarization division multiplexing (PDM)-QPSK system at a rate of 112 Gbps. The results indicate that authorized users can correctly decrypt the encrypted information, while unauthorized users can only obtain useful information with a bit error rate (BER) of approximately 0.5, verifying the effectiveness and security of the encryption scheme.