Enterprise Internal Threat Authentication Traceability Technology Based on Key Authentication System

In the current background of highly digitized enterprise information systems, insider threats have become the main source of risk for enterprise network security. This paper proposes an internal threat authentication and traceability technology based on a cryptographic key-based identity authentication system. By integrating asymmetric keys, behavior signatures, and log analysis, the system binds user identity with actions and enables full-process traceability. After deploying the system in a real enterprise environment, simulation tests show that the authentication system identifies malicious behaviors such as permission abuse, phishing attacks, and script injection with a success rate as low as 1.1% to 3.3%, effectively preventing such operations. At the same time, the success rate of normal user authentication is as high as 99.9%, reflecting its high reliability. Through behavior chain structure recording and abnormal behavior map identification mechanism, the system can trace malicious operation paths within seconds, greatly improving emergency response efficiency. After the system is deployed, the average data leaked by enterprises in information leakage incidents has dropped from 512MB to 37MB, effectively shortening the life cycle of the attack chain. The analysis of security return on investment shows that the integrated key authentication system can maintain a return rate of more than 60% under medium and high intensity investment, and has good economic benefits and popularization prospects.