Abstract: Provided in the present application are a one-time dynamic positioning authentication method, system and password changing method. The method comprises: an authentication server receives an authentication request from a client, generates a positioning factor string, and transmits generated information containing the positioning factor string and a structure of an all-element dynamic factor table to the client; the client receives the generated information, generates the all-element dynamic factor table, and maps the positioning factor string into the all-element dynamic factor table to acquire a dynamic graphical password inputted in accordance with a first positioning rule by a user and transmit to the authentication server; the authentication server receives the dynamic graphical password from the client, and if the first positioning rule corresponding to the parsed dynamic graphical password is consistent with a preset positioning rule, then the authentication is successful.

Abstract: The present application provides a dynamic graphical password-based network registration method and system. The method includes: a server receives a registration request transmitted by a client, selects positioning factors from a positioning factor library based on a structure of a full-element dynamic factor table, generates positioning factor strings, and transmits the generated positioning factor strings to the client; the client generates full-element dynamic factor tables based on the structure of the full-element dynamic factor table and the positioning factor strings, wherein a user inputs two dynamic graphical passwords through the full-element dynamic factor tables, and transmits registration information including a user name and the positioning rules corresponding to the dynamic graphical passwords to the server; wherein if the registration information is correct, the positioning rule in the registration information is used as the password of the user.