Starting from the computer network security and the commercial trade security, this paper expounds the security connotation of the electronic commerce, and puts forward some main security techniques such as the encipher, digit 从计算机网络安全、务交易安全出发,阐述了电子商务的安全内涵,提出了电子商务使用的主要安全技术,包括加密、字签名、子证书、子信封和双重签名等。