Eavesdropping Detection based on Power-Comparisons to Reconfigure Signature Keys in Optical Coding Access Networks
摘要：
In this paper, a scheme of signature code reconfiguration over optical code-division multiple-access(OCDMA) network is proposed to enhance multiple-users data transmission security. The security scheme is devised on the basis of two mechanisms: (1). Eavesdropping detection based on power comparison in local node; (2). Signature codes reconfiguration in each node on command of central control station. On eavesdropping detection, we sense significant power change while communicating nodes pair is suffering malicious attack. On signature reconfiguration, central station sends commands to the communicating transceiver nodes to change their signature keys. We illustrate with maximal-length sequence (M-sequence) codes as signature keys to the network nodes. These signatures are structured over arrayed-waveguide gratings (AWGs) devices. When eavesdropping occurs on aspecific network user, new code sequence is selected for the signature code reconfiguration in order to combat the behavior of eavesdropping.Simulation result shows that the spectral amplitude drops obviously after eavesdropping and the threshold value can be determined in order to detect the eavesdropping effectively.
