User authenticating method for payment terminal, involves calculating value of hashing function by client device for user authentication by server, and calculating another value of function by device for verification of user authentication

摘要

The method involves providing a client device e.g. token, having a variable encryption function e.g. SHA type hashing function. A value of the function, is calculated by the client device, for authentication of a user by a server. The calculated value is provided to the server. The user is authenticated by the server by using the provided value. A request is sent to the server by the user, by using the provided value. Another value of the function is calculated by the client device, for verification of the authentication of the user by the server. An independent claim is also included for a user authentication device.