Server capable of performing authentication with simplified and secure scheme that users who operate terminals communicating data with each other satisfy prescribed relation, method of controlling server, non-transitory storage medium encoded with computer readable control program, and information processing system

A method of controlling a server configured to communicate with a plurality of electronic terminal devices, the method comprising:

• obtaining physical position information of each terminal device and operation information corresponding to a physical input operation taken with respect to a surface of each terminal device, wherein time information is obtained together with the physical position information and/or operation information;
• determining whether the obtained physical position information of one terminal device and the obtained physical position information of at least one other terminal device satisfy a first prescribed condition;
• determining whether the obtained operation information of the one terminal device and the obtained operation information of the at least one other terminal device satisfy a second prescribed condition;
• receiving an authentication determination, the authentication determination providing enhanced security by being performed to depend on the first prescribed condition and the second prescribed condition being satisfied, and the obtained time information;
• and
• registering information relating to a user of the one terminal device and information relating to a user of the at least one other terminal device in correspondence with each other, conditioned on the authentication determination.

A non-transitory storage medium encoded with a computer readable control program executable by a computer of a server operable to communicate with a plurality of electronic terminal devices to perform functionality comprising:

• obtaining physical position information of each terminal device and operation information corresponding to a physical input operation taken with respect to a surface of each terminal device, wherein time information is obtained together with the physical position information and/or operation information;
• determining whether the obtained physical position information of one terminal device and the obtained physical position information of at least one other terminal device satisfy a first prescribed condition;
• determining whether the obtained operation information of the one terminal device and the obtained operation information of the at least one other terminal device satisfy a second prescribed condition;
• receiving an authentication determination, the authentication determination providing enhanced security by being performed to depend on the first prescribed condition and the second prescribed condition being satisfied, and the obtained time information;
• and
• registering information relating to a user of the one terminal device and information relating to a user of the at least one other terminal device in correspondence with each other, conditioned on the authentication determination.

An information processing system, comprising:

• a plurality of electronic terminal devices;
• and
• a server configured to communication with the plurality of terminal devices;
• the server including processing resources including at least one hardware processor and a memory, the processing resources being configured to control the server to at least:
• obtain physical position information of each terminal and operation information corresponding to a physical input operation taken with respect to a surface of each terminal device,
• determine whether the obtained physical position information of one terminal device and the obtained physical position information of at least one other terminal device satisfy a first prescribed condition,
• determine whether the obtained operation information of the one terminal device and the obtained operation information of the at least one other terminal device satisfy a second prescribed condition,
• receive an authentication determination, the authentication determination providing enhanced security by being performed to depend on the first prescribed condition and the second prescribed condition being satisfied, and the obtained time information, and
• register information relating to a user of the one terminal device and information relating to a user of the at least one other terminal in correspondence with each other, conditioned on the authentication determination.