A secure transmission scheme on link level for optical fiber communication systems

In secure communication systems, a very important problem is how to prevent wiretapping. Lots of researches on cryptography give good solutions on secure communications. But if a wire tapper can detect the existence of the transmitted information and get enough eavesdropped frames, cryptanalysis techniques can help to blindly recover the frame structures, error-control coding parameters and passwords. In this paper we propose a novel secure transmission scheme on the link level for optical fiber communication systems. Based on the blind frame synchronization technique, we propose to drop the traditionally strict frame structures in fiber communications and conceal the error-correcting-encoded blocks among random data, so that wire tappers cannot get enough coded packets to analyze and recover the transmitted information. Therefore, the proposed method is very suitable for secure communications and military communications.