Chaotic Encryption Scheme Based on Polar Coding in Fiber Optic Communication Systems

In this paper, a time-frequency domain chaotic encryption algorithm based on polar code is proposed. A logistic chaotic mapping is used to generate chaotic sequences for bit-level encryption inside polar coding, while the Rossler model is used to achieve displacement masking and spatial masking of constellations, which improves the security in the transmission process of fiber optic communication systems. The scheme implements a key space of size 10 ¹⁸³ . Both theoretical analysis and simulation results show that the algorithm has high security with nearly zero BER and performance loss.