| Citation: | CHEN Chun-yi, CAI Jin-xiang, LI Qiong. Shared secret-key generation from atmospheric MIMO optical channel[J]. Chinese Optics. doi: 10.37188/CO.2023-0202
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Shared secret-key extraction from random channel characteristics is an effective approach to ensuring the physical layer security of atmospheric optical channels. The secret-key generation rate and disagreement rate are two issues that attract a lot of attention. Using the random characteristics of atmospheric turbulent optical channels as a shared source of randomness, a secret-key extraction scheme for multiple-input multiple-output (MIMO) atmospheric optical channels is proposed. The alternative singular value decomposition is used to decompose the channel matrix; the correlation between the two channel characteristic sequences obtained by the two legitimate parties is enhanced by carrying out a simple moving average; a channel quantization alternating scheme with a single threshold is used to quantize the resultant channel characteristic sequences. The two legitimate parties generate random controlling sequences for coding mapping based on differential diversity values, which are used in performing coding mapping of the quantized bits of the channel characteristic sequences generated by the channel quantization alternating scheme with a single threshold. The experimental results show that our scheme’s initial key disagreement rate can reach 5.2×10−4 at a signal-to-noise ratio of 30 dB, and that the generated random bit sequences have passed the National Institute of Standards and Technology (NIST) randomness test. This paper’s results are useful in the implementation of secret-key extraction from atmospheric MIMO optical channels.
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