A Sectional Encryption Algorithm of Network Information Based on Cyclic Shift Key Code

Traditional chaotic encryption scheme of network information does not consider the data compression of synchronization and encryption, and the cyclic code encryption of network information cannot be achieved, resulting in the predictability of cipher text is not good, which cannot meet the requirements of secret communication. The ergodic properties and sensitivity to the system parameters of chaotic sequences is used, an improved coding and encryption scheme for source coding is designed based on Hoffman coding, and the cyclic shift technology is used, a sectional encryption algorithm of network information is proposed based on cyclic shift key code. The sectional linear chaotic map and the Logistic map have larger parameter space and phase space, the sectional linear chaotic map is applied in the arithmetic coding. The synchronization arithmetic coding and network information coding method are fused. Simulation result shows that the new network information coding method has a stable compression ratio output, and the average change rate of the cipher text sequence is between 47.652%~49.926%, which is close to the ideal value of 50%, it can effectively resist searching attack with brute force, the unpredictability of cipher text is improved, which ensures the network communication security.