| 摘要 |
PROBLEM 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. SOLUTION: 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. COPYRIGHT: (C)2005,JPO&NCIPI |
