Authentication manner of use authority, the use permit issue device and the authentication system of use authority, are jointed by the server and the aforementioned user terminal which

摘要

PPROBLEM TO BE SOLVED: To enable the safe use of computer resources in a terminal with low computing performance from a non-safe user terminal through a non-safe network. PSOLUTION: The license issuing device 10 confirms a user password inputted by a user 2, generates a communication key 104 and a license 103, and transmits them with a date/time 105 and an expiration 102 of the communication key to a user terminal 20. The user terminal 20 encrypts the license 103, a user identifier, and the date/time with the communication key 104, and transmits the result to a server 30. The server 30 decodes the license 103 received from the user terminal 20 with a server password 301, examines the expiration of the communication key 104 based on the decoded result, decodes the received encrypted user identifier and date/time 105 when the communication key does not expire, and transmits the date/time 105 encrypted with the communication key 104 to the user terminal 20. PCOPYRIGHT: (C)2005,JPO&NCIPI