A Key Space Enhanced Chaotic Encryption Scheme for Physical Layer Security in OFDM PON
In this paper, we propose a key space enhanced chaos based encryption scheme with no requirement of redundant sideband information in an orthogonal frequency division multiplexing passive optical network (OFDM PON) For the first time, a simple 1 D chaotic logistic map is employed to scramble the chaotic subcarrier allocation both in time/frequency domain and logical operation, which provides a huge key space to enhance the physical layer confidentiality. Due to the dynamic chaotic permutations, the largest key space is achieved in comparison with the reported encryption schemes in OFDM PON. In addition, a ~10 Gb/s secure transmission with encrypted OFDM data is experimentally demonstrated over 25 km standard single mode fiber. The proposed encryption scheme demonstrates the excellent security of data transmission in OFDM PON and the robustness against exhaustive attacks.
IEEE Photonics Journal