Optical Code Scrambling Technique for Security Enhancing in Optical Stealth System

In this paper, an approach for enhancing the security against eavesdropping in optical stealth system is proposed and demonstrated via computer simulations. The proposed approach is based on the concept of optical code-division multiple-access (OCDMA) technology, and the technique of optical code scrambling is applied to enhance the security of stealth channel. Based on this technique, a stealth channel is successfully embedded into a public network without requirement for the transmission of the scrambling key. The results show that both the stealth and the public channels can achieve error-free performance, where the stealth channel has a little impact on the public channels. Moreover, the security of the stealth channel against eavesdropping with different interception methods is discussed.