An Integrated Security Mechanism for Intranet Accessing

User authentication has long been the cornerstone of intranet security. This paper proposes an integrated security mechanism based on USB-key and MD5 authentication, which improve the system security and enhance the availability of the intranet computers. A USB-key driver is loaded as a system service and read the status of USB-key to decide whether to start the computer. For user authentication an optimized MD5 algorithm is put forward to protect the transfer of user's identity information. Experiment results prove the feasibility and reliability of the model.