Abstract:

Due to the limitation of network,the data communication security between clients and servers is an important issue in the asynchronous network system.The paper deeply analyzes the common encryption technologies,such as RSA,DES,MD5,and put forward a new communication security model based on their limitations.The proposed model applies multiple encryption technologies comprehensively to improve the quality of raw data,the reliability of data sources and whereabouts,thus increasing the security of data communication.

Key words: encryption；asynchronous system；communication security