Ciphertext-Policy Attribute-Based Encryption

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Ciphertext-Policy Attribute-Based EncryptionJohn BethencourtCarnegie Mellon Sahai Waters SRI several distributed systems a user should only beable to access data if a user posses a certain set of cre-dentials or attributes. Currently, the only method forenforcing such policies is to employ a trusted server tostore the data and mediate access control. However, ifany server storing the data is compromised, then theconfidentiality of the data will be compromised. In thispaper we present a system for realizing complex accesscontrol on encrypted data that we call ciphertext -PolicyAttribute- based Encryption .

an encrypted form so that it will remain private even if a server is compromised. Most existing public key encryption methods allow a party to encrypt data to a particular user, but are unable to efficiently handle more expressive types of en-crypted access control such as the example illustrated above.

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