Dynamic cipher authentication system and method

The present invention provides a dynamic password certification system, and comprises an application client, a mobile terminal, an application server module, an information certification module and a short message gateway module. The application server module is connected with the application client, and is used for receiving the user information, sending the user information and/or certification request information to the information certification module, and providing the application service according to the user certification information returned by the information certification module. The information certification module is used for checking the identity of the user according to the user information, so as to generate dynamic passwords; the dynamic passwords and the information of the user mobile terminal of the user are transmitted to the short message gateway module. The short message gateway module is used for transmitting the dynamic passwords to the mobile terminal according to the mobile terminal information of the user. The present invention also provides a dynamic password certification method. The dynamic password certification system requires no periodic maintenance of time synchronism, and has flexibility and security.