| 摘要 |
A system for attribute-based encryption comprises a first encrypter (11) and a second encrypter (12). The first encrypter (11) comprises an input unit (1) for determining a message and a policy over a set of attributes, wherein the policy comprises a plurality of components, and a first cryptographic unit (2) for generating an encrypted representation of the message and an encrypted representation of the plurality of components. The second encrypter (12) comprises a receiving unit (3) for receiving the encrypted representation of the message and the encrypted representation of the plurality of components, and a second cryptographic unit (4) for transforming the encrypted representation of the message and the encrypted representation of the plurality of components into an attribute-based encrypted message associated with the policy. |
