Abstract:

In order to transmit network datas safely among terminal devices,the design of secure file transfer system based on embedded Linux is introduced.The architecture of secure file transfer system is  introduced,the way of designing system software of server and client is explained based on SSL（Secure Socket Layer）protocol,and
system security is analyzed.The file between server and client is encrypted through the ssl protocol during the transportation,and the server is connected by several clients because of multithreading.The design can help solve the problems in transmitting network datas safely and facilitate to develop network security in the mobile internet.

Key words: Linux, secure socket layer(SSL) protocol, secure file transfer, multi-threading