Application of data encryption technology in computer network security

In the context of the coexistence of digital transformation and network security threats, data encryption technology has become the core pillar of the defense system. Aiming at the inherent defects of traditional symmetric encryption algorithms and asymmetric encryption algorithms in key management, anti-attack ability and computing efficiency, this paper proposes a hybrid encryption algorithm model based on the fusion of symmetric encryption algorithms and asymmetric encryption algorithms. It achieves accurate feature vector extraction and noise filtering of network data, and constructs an encryption framework that takes into account cryptographic strength, real-time performance and cross-platform compatibility. Experiments show that the hybrid algorithm is significantly better than the single encryption protocol in key space size, limit encryption constant value and attack index, which verifies its technical advantages in resisting complex threats such as brute force cracking and man-in-the-middle attack, and provides theoretical support for the evolution of intelligent network security protection system.