This work considers the joint problem of securing confidential demands against eavesdropping attacks and protecting the network against link failures in elastic optical networks (EONs). Network coding is used to provide security for confidential connections by encrypting the data through XOR operations at the physical layer with other established connections in the network. Backup paths are also computed for protecting the primary path of the confidential connections, while ensuring that the level of security for the confidential demands is preserved in case of a link failure on the primary path or on any of the paths involved in the XOR process. A realistic network scenario is modeled, where four different classes of connections are considered with respect to their protection and security requirements, while a combination of novel integer linear programming (ILP) and heuristic algorithms are used to establish each class of demands in the network. The proposed algorithms are evaluated in terms of spectrum utilization, network blocking, and level of security provided. From the results obtained it is evident that confidential connections can be transmitted in a secure manner, while for the classes that require both security and protection, the connections retain their required level of security in the event of any single link failure in the network.

这项工作考虑了共同的问题，即确保机密需求免受窃听攻击并保护网络免受弹性光网络（EON）中的链路故障的影响。网络编码用于通过物理层与网络中其他已建立连接的XOR操作对数据进行加密，从而为机密连接提供安全性。还计算备用路径以保护机密连接的主路径，同时确保在主路径或XOR流程中涉及的任何路径发生链路故障的情况下，保留机密需求的安全级别。对现实的网络场景进行了建模，其中针对其保护和安全要求考虑了四种不同类型的连接，同时结合使用新颖的整数线性规划（ILP）和启发式算法来建立网络中的每一类需求。根据频谱利用率，网络阻塞和提供的安全级别对提出的算法进行了评估。从获得的结果可以明显看出，可以以安全的方式传输机密连接，而对于同时需要安全性和保护性的类，如果网络中出现任何单个链路故障，则连接将保持其所需的安全级别。