Ren Jianxin, Liu Bo, Wan Yibin, Zhu Xiaorong, Ullah Rahat, Ma Yiming, Wu Xiangyu, Mao Yaya, Sun Tingting, Zhang Chenfang, Shen Shikui, Wang Zelin, Wang Guangquan
Opt Express. 2022 Dec 19;30(26):47896-47908. doi: 10.1364/OE.478249.
A mode division multiplexing (MDM) chaotic encryption scheme based on key intertwining and accompanying transmission is proposed in this paper. Based on the weakly coupled few-mode fiber (FMF), data and time-varying keys can be accompanied by transmission in two modes, LP01 and LP11, respectively. In order to generate a new key, the current key is XORed with all of the keys from all the preceding moments, one by one. To implement chaotic masking in the digital domain, the three chaotic sequences corresponding to the new key are adopted to encrypt the data at the constellation phase, data symbol block, and subcarrier levels. An 8.89 Gb/s encrypted 16QAM-OFDM signal transmission over 1 km weakly-coupled FMF is experimentally demonstrated. The receiver with the correct key can recover the data normally, while the BER of the illegal receiver remains around 0.5. In the case of the key transmission bit rate of 1 Gb/s, the cracking efficiency threshold of the time-varying key encryption scheme is 5.21 × 10 times that of the time-invariant key encryption scheme, which suggests that the proposed work is a promising candidate for future physical layer security.
本文提出了一种基于密钥交织与伴随传输的模式分割复用（MDM）混沌加密方案。基于弱耦合少模光纤（FMF），数据和时变密钥可分别在LP01和LP11两种模式下伴随传输。为生成新密钥，将当前密钥与之前所有时刻的密钥逐一进行异或运算。为在数字域实现混沌掩码，采用与新密钥对应的三个混沌序列在星座相位、数据符号块和子载波级别对数据进行加密。实验验证了8.89 Gb/s加密16QAM-OFDM信号在1 km弱耦合FMF上的传输。具有正确密钥的接收器能够正常恢复数据，而非法接收器的误码率保持在0.5左右。在密钥传输比特率为1 Gb/s的情况下，时变密钥加密方案的破解效率阈值是时不变密钥加密方案的5.21×10倍，这表明所提出的方案是未来物理层安全的一个有前途的候选方案。
