Abstract:

Aim to enterprise LAN(Local Area Network) for transmission of confidential information, the use of access control policy and information strategy for the combination of encryption theory, in order to prevent the illegal intruder to steal information or changes in the overall surveillance network encryption and information security, in the secure transmission system (hardware) use the firewall IP（Internet Protocol）address and MAC（Media Access Control）  address binding+based on the switch port  MAC address binding with the secondary network management control system; file encryption／decryption (software) system uses the DES(Data Encryption Standard) algorithm for the design of the symmetry of the confidentiality of information transmission software.With an emphasis on the implementation of several hardware, DES encryption／decryption algorithm and operating procedures, in order to facilitate the implementation of enterprise systems to reduce the development cycle. Since the DES encryption／decryption process is simple, improve the system of confidential information in the encryption／decryption speed of the system of price. This system in the transmission of information security has  the user requirements and has beenused in a number of enterprise local area network applications.

Key words: encryption algorithm, network, data encryption