| Abstract:In the integrated communication system of air, space, earth, and sea, physical layer security faces multiple challenges such as dynamic and time-varying heterogeneous channels, significant multipath fading, and insufficient compatibility with quantum key distribution. The transmission process of long frame structures often fails to decrypt due to accumulated bit error rates, and a single quantum key is difficult to balance randomness and transmission efficiency in hexadecimal hash mapping, seriously restricting the reliability and security of cross domain communication. Therefore, an optimization algorithm for secure chaotic quantum encryption in the physical layer of integrated communication between air, space, earth, and sea was designed. Construct a gate group agreed upon by both parties in the quantum logic conversion gate, and introduce a chaotic sequence into the quantum gate to construct a chaotic quantum key for secure encryption in the communication physical layer. Generate a digest of chaotic quantum keys using hash functions, convert the output hash value into binary numbers, and establish an integrated communication security key encryption channel. Using a reasonable bit error rate as a threshold, the physical layer secure communication signal frame structure is solved in both the uplink and downlink channels to achieve secure encryption optimization of integrated communication information across air, space, air, and sea. The final optimization results show that under the condition of a signal-to-noise ratio of 0-25dB, the encryption error rate varies within the range of 0-0.3%, and the integrity of the encrypted information is high, which plays an important role in the security of integrated communication between air, ground, air and sea. |
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