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Physical-layer encryption and authentication scheme based on SKGD and 4D hyper-chaos.

Danyang Wang, Hongxiang Wang, He Xu

|May 8, 2023

Summary

This study introduces a novel method for simultaneous encryption and digital identity authentication in point-to-point optical links (PPOL). This enhances physical-layer security by resisting eavesdropping with unique, hyper-chaotic generated identity codes.

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Area of Science:

Optical Communications
Physical Layer Security
Cryptography

Background:

Point-to-point optical links (PPOL) require robust security measures against eavesdropping.
Current authentication methods may be vulnerable to passive attacks.
Simultaneous encryption and authentication are desirable for enhanced security.

Purpose of the Study:

To propose a novel scheme for integrated encryption and digital identity authentication in PPOL.
To enhance physical-layer security by resisting passive eavesdropping.
To enable secure key generation and distribution (SKGD).

Main Methods:

Utilizing identity codes encrypted by a key for authentication.
Employing phase noise estimation of the optical channel for secure key generation and distribution (SKGD).
Generating random and unpredictable identity codes using a four-dimensional (4D) hyper-chaotic system.
Leveraging local laser, EDFA, and public channel as entropy sources for symmetric key extraction.

Main Results:

Successfully verified 0.95 Gbit/s error-free SKGD in a QPSK PPOL system over 100km of standard single-mode fiber.
The 4D hyper-chaotic system provides a large key space of approximately 10^125 for identity codes, resisting exhaustive attacks.
Demonstrated effective resistance against passive eavesdropping attacks.

Conclusions:

The proposed scheme effectively integrates encryption and digital identity authentication for PPOL.
The method significantly enhances the security of both key and identity.
The use of a 4D hyper-chaotic system ensures high randomness and unpredictability for authentication codes.