Method, device and system for negotiating authentication mode

A terminal, comprising:

• a sending unit adapted to send a first negotiation request carrying an authentication mode supported by the terminal to an authentication server, so that the authentication server determines and sends an authentication mode supported by both the authentication server and the terminal, where the authentication mode supported by both the authentication server and the terminal is determined according to an authentication mode supported by the authentication server and the authentication mode supported by the terminal in the first negotiation request;
• and
• a receiving unit connected to the sending unit and adapted to receive from the authentication server the authentication mode supported by both the authentication server and the terminal.

A system for negotiating authentication mode, comprising a terminal and an authentication server, which are connected in series, wherein

• the terminal is adapted to send a first negotiation request carrying an authentication mode supported by the terminal to the authentication server, so that the authentication server determines and sends an authentication mode supported by both the authentication server and the terminal, where the authentication mode supported by both the authentication server and the terminal is determined according to an authentication mode supported by the authentication server and the authentication mode supported by the terminal in the first negotiation request, and to receive from the authentication server the authentication mode supported by both the authentication server and the terminal.

An authentication server, comprising:

• a sending unit adapted to send a second negotiation request carrying a first authentication mode supported by the authentication server to a terminal, so that the terminal determines an authentication mode supported by both the authentication server and the terminal according to an authentication mode supported by the terminal and the first authentication mode supported by the authentication server in the second negotiation request;
• and
• a receiving unit adapted to receive from the terminal the authentication mode supported by both the authentication server and the terminal.

A system for negotiating authentication mode, comprising a terminal and an authentication server connected to each other, wherein

• the terminal is adapted to receive from the authentication server a second negotiation request carrying a first authentication mode supported by the authentication server, determine an authentication mode supported by both the authentication server and the terminal according to an authentication mode supported by the terminal and the first authentication mode supported by the authentication server in the second negotiation request, and send the authentication mode supported by both the authentication server and the terminal to the authentication server.