| 摘要 |
An information processing system and method for realizing efficient processing using an enabling key block (EKB) using a categorized tree structure. An EKB composed of encrypting data for encrypting an upper-order key by using a lower-order key on a selection path of a key tree having sub-trees managed by a category entity is created and provided to a device. When a request to create an EKB is made, a structure for creating a route key by itself or a structure for requesting a key distribution center to create a route key is selectively executed. Further a structure for requesting a category entity to create a sub-EKB when the EKB distribution center creates an EKB is provided, and therefore the EKB creation and management are made efficient. |
