A Predicate Encryption Scheme Supporting Multiparty Cloud Computation

Multiparty cloud computation can deal with the problem that the traditional homomorphic encryption can´t operation on the ciphertexts generated by different users, and the final result is computed by cloud server. The trivial multiparty cloud computation doesn´t take the access control to the final result into consideration. In reality, we perhaps do not want all parties to gain the result. In this paper we construct a predicate encryption with multiplicative homomorphic property for the class of inner-product predicates. The scheme can also support multiparty cloud computation. By use of predicate encryption, we can realize the fine-grained access control. At last, we prove that our scheme is secure under IND-AH-CPA.