Abstract
We propose the first identity based adaptive oblivious transfer protocol with access control (IBAOT-AC) secure in universal composable (UC) framework. The IBAOT-AC is run between multiple senders, multiple receivers and an issuer. Each sender incorporates its identity and access policies associated with the messages in the generation of ciphertext database. Receivers whose attribute sets satisfy the access policy associated with the message and who interact with a sender generating the corresponding ciphertext can only recover the message. The scheme supports access policy in disjunctive form, thereby, realizes disjunction of attributes. The proposed scheme is UC secure in the presence of malicious adversary under \(q\)-Strong Diffie-Hellman (SDH), Decision Bilinear Diffie-Hellman (DBDH), \(q\)-Decision Bilinear Diffie-Hellman Exponent (DBDHE) and Decision Linear (DLIN) assumptions. The scheme outperforms the existing similar schemes in terms of both communication and computation.
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