Research on encryption algorithms in terahertz communication systems

Aiming at the problem that the terahertz wave beam is narrow and directionality is strong, which makes it easy for the enemy to eavesdrop on the data information, and thus the information cannot be transmitted safely, a pseudo-random sequence generation method based on n-LFSR and AV-NL chaotic mapping is proposed. Different algorithms are selected according to the number of LFSRs. At the same time, the absolute value nonlinear chaotic map is generalized. Finally, the generated two pseudo-random sequences are XOR combined to form the final pseudo-random sequence for source encryption. The simulation results show that this method takes into account the advantages of simple design of linear feedback shift register and high chaotic randomness. The generated pseudo-random sequence has both high linear complexity and the advantages of chaotic non-linearity. The high randomness used in source encryption can improve the security of the system.