| 摘要 |
<p>A memory card 30 includes a storage unit 302 storing key information and version information in association with the key information, the key information and the version information being issued by a key issuing authority, and the version information indicating a version of the latest revocation list that has been issued when the key information is generated; a revocation list receiving unit 304 that receives a revocation list having a version; a version verification unit 308 operable to compare the version of the revocation list received by the revocation list receiving unit 304 and the version information; and a revocation list writing unit 309. When the version of the revocation list is older than version information, processing by the revocation list writing unit 309 is prohibited.</p> |
