Two factors affecting covert tapping are first investigated by deducing the fiber bending loss formula.

Random network coding against the eavesdropping adversaries

This paper analyses of the submarine optical fible cable signals eavesdropping technology channels,discussed the waters of China′s submarine fiber optic cable for wiretap method,the United States nuclearpowered attack submarines" Jimmy·Carter,"the eavesdropping undersea fiber optic cable capacity.

Based on optical fiber-bending radiation,four steps method for optical cable tapping,bending the optical fiber,collecting optical signals and demodulating information are proposed.

By analyzing Four Wave Mixing (FWM) theory, we propose a new tapping and attacking method by virtue of ROADM.

In order to collect the information about the terrorism,the American government approved the" Patriot Act" and thus enlarged swiftly the power of the government for tapping and wiretap surveillance,which has been doubted by the public,but in the subsequent years,the American government still takes a series of measures to strengthen the surveillance procedure.

The works are as follows:1、Proposed a framework for security analysis, pointed out the parameters which related to security in address codes, analysed the securiyt performance from the perspective of two common eavesdropping methods, deduced the time eavesdropper required when taped single-signals from multiple users and the ability to tap a single user and multiple users.

Then it analyzes the wiretap and RTP injection attack.