Optimization of data packet encryption algorithm in network link transport layer

With the rapid development of information technology, huge data information is exchanged every moment in various types of networks, which contain information such as commercial secrets and personal privacy, and data security has a great impact on people’s lives. To address the issues of low efficiency and poor security in network link transmission layer database security encryption systems, a new system is studied and designed to strengthen the protection of data information from both hardware and software aspects. Then, a discrete chaotic system is introduced to ensure the stability of the dynamic grouping encryption algorithm. Finally, trajectory loop rotation is used to obtain address clusters using the discrete chaotic system, and dual address loop rotation is used to achieve the variability of the dynamic grouping algorithm. The experiment shows that for different file sizes, the encryption speed of the Dynamic Packet Encryption Optimization (DPEO) algorithm is stable between 5.84 and 5.98 mb/s. And after minor changes in the key, the NPCR of the ciphertext obtained by the DPEO algorithm exceeds 99.5%. In addition, its operation efficiency is excellent, reaching the stable entropy value in only 0. 52 s. In summary, the DPEO algorithm in the network link transport layer database security encryption system can combine high efficiency and excellent security performance.