Method and system for authenticating communication terminals

A server system communicably connected with a communication terminal via communication means, wherein an authenticated result for a user who handles the communitarian terminal is made reference to provide data from the server system to the communication terminal via the communication means, the server system comprising:

• a first authentication unit configured to authenticate user-identifying information transmitted from the communication terminal and generate first key information based on the user-identifying information so that the first key information is transmitted from the server system to the communication terminal;
• a second authentication unit configured to authenticate the first key information transmitted from the communication terminal and generate second key information to access the data based on the first key information so that the second key information is transmitted from the server system to the communication terminal;
• and
• an access permitting unit configured to permit the data to be accessed within a predetermined period of time, the access being carried out on the basis of the second key information transmitted from the communication terminal.

An authentication method, in which a communication terminal is communicably connected to a server system via communication means, wherein an authenticated result for a user who handles the communitarian terminal is made reference to provide data from the server system to the communication terminal via the communication means, comprising the steps of:

• authenticating user-identifying information transmitted from the communication terminal;
• generating first key information based on the user-identifying information so that the first key information is transmitted from the server system to the communication terminal;
• authenticating the first key information transmitted from the communication terminal;
• generating second key information to access the data based on the first key information so that the second key information is transmitted from the server system to the communication terminal;
• and
• permitting the data to be accessed within a predetermined period of time, the access being carried out on the basis of the second key information transmitted from the communication terminal.

A computer-readable program installed in a server system communicably connected with a communication terminal via communication means, wherein an authenticated result for a user who handles the communitarian terminal is made reference to provide data from the server system to the communication terminal via the communication means, the program makes a computer realize the functions of:

• first authentication means for authenticating user-identifying information transmitted from the communication terminal and generate first key information based on the user-identifying information so that the first key information is transmitted from the server system to the communication terminal;
• second authentication means for authenticating the first key information transmitted from the communication terminal and generate second key information to access the data based on the first key information so that the second key information is transmitted from the server system to the communication terminal;
• and
• access permitting means for permitting the data to be accessed within a predetermined period of time, the access being carried out on the basis of the second key information transmitted from the communication terminal.

A recording medium storing thereon a computer-readable program installed in a server system communicably connected with a communication terminal via communication means, wherein an authenticated result for a user who handles the communitarian terminal is made reference to provide data from the server system to the communication terminal via the communication means, the program makes a computer realize the functions of:

• first authentication means for authenticating user-identifying information transmitted from the communication terminal and generate first key information based on the user-identifying information so that the first key information is transmitted from the server system to the communication terminal;
• second authentication means for authenticating the first key information transmitted from the communication terminal and generate second key information to access the data based on the first key information so that the second key information is transmitted from the server system to the communication terminal;
• and
• access permitting means for permitting the data to be accessed within a predetermined period of time, the access being carried out on the basis of the second key information transmitted from the communication terminal.