Patent ID: 8332915

Claim:
An information processing system, comprising: a computer; and a mobile terminal that can communicate with the computer in a predetermined area, and wherein, the computer sends a random number for encrypting user information to the mobile terminal, the computer registering identification information of mobile terminals to be permitted to access the computer; the mobile terminal encrypts user information using the random number sent from the computer, and sends the encrypted user information to the computer, the user information indicating identification information in relation to access to the computer from the mobile terminal; the computer decodes the encrypted user information sent from the mobile terminal using the random number, and compares the decoded information with the identification information registered; and when the decoded user information is the same as the identification information that is registered in the computer, the computer permits access to the computer, when the decoded information is not the same as the identification information that is registered, the computer prohibits access to the computer.