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Physical Layer Cyber Resilience Oriented Dynamic Secure Polar Code
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DOI：10.1109/ACCESS.2025.3545029.png)
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Abstract
En 中文
Cyber resilience has attracted worldwide attention. Security and reliability of information transmission are considered to be two key characteristics from the perspective of physical layer cyber resilience. Consequently, a dynamic secure polar code is proposed in this paper to improve the physical layer resilience of the non-degraded channels, in which a shared key is firstly used as a seed to produce a pseudo-random sequence that is further used to generate a dynamic generator matrix to obfuscate the coding structure. Then, a small amount of random column vectors are inserted into the generator matrix to destroy the systematicness of the code. Finally, the hash value of the key is used as frozen bits to avoid the leaking of the key. Confidentiality analysis and computer simulations were carried out for the proposed scheme. The results show that the proposed scheme has high security against cryptanalysis attacks. Meanwhile the eavesdropper's bit error rate is kept above 0.435 in non-degraded channel scenarios, and the reliability is almost the same with that of the original polar code. Furthermore, the frame error rate of the proposed scheme is about 1/10 of the existing schemes in low signal-to-noise ratio regimes.
Keywords:
Polar codes
Generators
Encoding
Security
Decoding
Reliability
Resilience
Codes
Vectors
Encryption
Cyber resilience
physical layer encryption
polar code
non-degraded channel