Abstract: In order to realize the information authentication in e commerce, a new message digest codes generating algorithm is established, that is suitable for all kind of language message. The security of message digest code can be adjusted according to a given demand. It is verified by an example. Its reliability and correctness are proved theoretically and practically. Hardware or software can realize the algorithm with high speed. It can be widely used in e commerce for MDC production. It has some practical sense to the development of China’s e commerce