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Traceless encryption approach for physical layer security in coherent optical communications system.

Zan-Shan Zhao, Pei-Li Li, Wei-Ming Gan

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    Summary

    We developed a novel traceless encryption method for secure optical communications. This approach encrypts signals without altering modulation formats, making them undetectable to eavesdroppers while maintaining decryption accuracy.

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    Area of Science:

    • Optical Communications
    • Physical Layer Security
    • Cryptography

    Background:

    • Coherent optical communication systems are vulnerable to eavesdropping.
    • Existing encryption methods can alter signal characteristics, alerting potential intruders.
    • There is a need for undetectable encryption techniques in optical networks.

    Purpose of the Study:

    • To propose and numerically investigate a traceless encryption approach for physical layer security in coherent optical communications.
    • To evaluate the security performance and feasibility of the proposed encryption scheme.
    • To analyze the impact of decryption parameters on the system's robustness.

    Main Methods:

    • Numerical simulation of a coherent optical communication system.
    • Implementation of a traceless encryption technique using phase and/or amplitude modulation.
    • Design and application of three distinct encryption rules.
    • Analysis of eavesdropping misinterpretation rates and decryption performance under varying control light power.

    Main Results:

    • The proposed traceless encryption effectively disguises Quadrature Phase-Shift Keying (QPSK) signals into formats like 8PSK, QPSK, and 8 Quadrature Amplitude Modulation (8QAM).
    • Encryption resulted in significant misinterpretation rates for eavesdroppers: 37.5% for 8PSK, 25% for QPSK, and 62.5% for 8QAM.
    • When the encrypted signal's modulation format matched the original, the scheme concealed information and could mislead eavesdroppers.
    • The decryption performance demonstrated good tolerance to fluctuations in control light peak power at the receiver.

    Conclusions:

    • The developed traceless encryption method offers a promising solution for enhancing physical layer security in optical communications.
    • The scheme's ability to maintain regular modulation formats makes it difficult for eavesdroppers to detect encryption.
    • The encryption approach provides flexibility in security levels and robustness against receiver power variations.