In this work, an eavesdropping-aware routing and spectrum allocation approach is proposed utilizing network coding (NC) in elastic optical networks (EONs). To provide physical layer security in EONs and secure the confidential connections against eavesdropping attacks using NC, the signals of the confidential connections are combined (XOR-ed) with other signals at different nodes in their path, while transmitted through the network. The combination of signals through NC significantly increases the security of confidential connections, since an eavesdropper must access all individual signals, traversing different links, in order to decrypt the combined signal. A novel heuristic approach is proposed that solves the combined network coding and routing and spectrum allocation problem that also takes into account additional NC constraints that are required in order to consider a confidential connection as secure. Different routing and spectrum allocation strategies are proposed, aiming to maximize the level of security provided for the confidential demands, followed by an extensive performance evaluation of each approach in terms of the level of security provided, as well as the spectrum utilization and blocking probability, under different network conditions. Performance results demonstrate that the proposed approaches can provide efficient solutions in terms of network performance, while also providing the level of security required for each demand.

在这项工作中，提出了一种利用弹性光网络（EON）中的网络编码（NC）进行监听的路由和频谱分配方法。为了在EON中提供物理层安全性并使用NC保护机密连接免受窃听攻击，机密连接的信号在路径中的不同节点处与其他信号组合（异或），同时通过网络传输。由于窃听者必须访问所有单独的信号（遍历不同的链接）才能解密组合的信号，因此通过NC组合的信号显着提高了机密连接的安全性。提出了一种新颖的启发式方法，该方法解决了组合的网络编码，路由和频谱分配问题，该问题还考虑了将机密连接视为安全所需的其他NC约束。提出了不同的路由和频谱分配策略，旨在最大程度地满足机密需求的安全级别，然后根据所提供的安全级别以及频谱利用率和阻塞概率对每种方法进行广泛的性能评估，在不同的网络条件下。性能结果表明，所提出的方法可以在网络性能方面提供有效的解决方案，同时还可以提供每种需求所需的安全级别。