Opt Express. 2022 Nov 21;30(24):43826-43841. doi: 10.1364/OE.471213.
In order to tackle the security and privacy problems in optical networks, a novel mesh-based optical security network exploiting double masking (DM) scheme for multipoint confidential communication is proposed and studied theoretically. For each node in the network, a pair of mutually asynchronous vertical-cavity surface-emitting lasers (VCSELs) are required as transceivers, and the delay fiber (DF) is used to set different time delays as network node markers. In this security network, the encryption of the message is implemented on the transmitter of the source node by using the DM scheme, and the encrypted message is transmitted to the receiver of the destination node through the optical network for decryption. Each network node can output its individual chaotic signals separately with different time delay markers. By regulating different internal parameter mismatches, the synchronization characteristics of transceivers in a security network are numerically analyzed by using the cross correlation coefficient. Simulation results show that the chaos synchronization between transceivers enjoys fantastic robustness to mismatched parameters. Meanwhile, the tolerance of the DM scheme to the inherent parameter mismatch is excellent, so it is suitable for constructing secure networks in optical networks. Besides, based on the high quality synchronization with a correlation coefficient of 0.983, the communication performances of the longest path channel are investigated for a given metropolitan area network scale. Two pieces of 10 Gb/s messages can be effectively concealed in the chaos and decoded gratifyingly behind 100 km transmission, and the system has reliable security to resist illegal attacks. Finally, the network performance simulation is conducted for diverse configurations of the mesh-based optical networks. All the results confirmed the chaotic encryption scheme provides a novel way for any two legitimate nodes to establish security keys in optical networks.
为了解决光网络中的安全和隐私问题，提出并理论研究了一种利用双掩蔽（DM）方案进行多点保密通信的新型基于网格的光安全网络。对于网络中的每个节点，都需要一对相互异步的垂直腔面发射激光器（VCSEL）作为收发器，并且使用延迟光纤（DF）来设置不同的时间延迟作为网络节点标记。在这个安全网络中，消息的加密是在源节点的发射器上通过 DM 方案实现的，加密的消息通过光网络传输到目的节点的接收器进行解密。每个网络节点都可以用不同的时间延迟标记分别输出其单独的混沌信号。通过调节不同的内部参数失配，使用互相关系数对安全网络中收发器的同步特性进行了数值分析。仿真结果表明，收发器之间的混沌同步对失配参数具有极好的鲁棒性。同时，DM 方案对固有参数失配的容忍度也非常好，因此非常适合构建光网络中的安全网络。此外，基于高相关系数为 0.983 的高质量同步，对给定的城域网规模的最长路径信道的通信性能进行了研究。可以有效地将两个 10 Gb/s 的消息隐藏在混沌中，并在 100 km 传输后令人满意地解码，系统具有可靠的安全性来抵御非法攻击。最后，对基于网格的光网络的不同配置进行了网络性能仿真。所有结果都证实了混沌加密方案为光网络中的任意两个合法节点建立安全密钥提供了一种新方法。
