| 摘要 |
Information distribution methods, systems and apparatus are provided in which, rather than specifying the addresses of recipients of a content, a combination of attributes is specified as criteria so that only those recipients that meet the criteria can receive the content. An example embodiment, provides an attribute key management server for managing secret keys and public keys for given attribute values, user terminals for accessing the attribute key management server to obtain attribute secret keys corresponding to their attributes generated based on secret keys, and a provider terminal for generating an encrypted content that can be decrypted by user terminals that has the attribute secret keys corresponding to given attributes. The provider terminal distributes the encrypted content and the user terminals decrypt the encrypted content that can be decrypted by using their attribute secret keys.
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