Utilization device, the server device, service utilization system, service usage, service utilization program and integrated circuit

摘要

PROBLEM TO BE SOLVED: To provide a utilizing apparatus, a server device and a key using system by which reliable deletion of an old key in the utilizing apparatus can be controlled without using a secure clock as in a conventional way and encryption communication can be established regardless of key renewal in a server to be connected.;SOLUTION: In the key using system 1, one or more server devices 5-1 to 5-n provide apparatuses holding equipment keys corresponding to server keys with services. An updating apparatus 2 distributes server keys and new equipment keys for updating to the server devices and a key using apparatus 3. A CRL distributing apparatus 4 distributes CRL indicating server devices whose key updating is completed to the key using apparatus 3. The key using apparatus 3 holds both of the old equipment key and the new equipment key and determines whether key updating is completed for the server devices which are objects of monitoring by using the CRL. If updating is completed, it deletes the old equipment key.;COPYRIGHT: (C)2009,JPO&INPIT