A ciphertext-based proxy secure two-party computation protocol(CPSTCP) which can be used in shared storage platform is proposed.We presented its conception and define its formal model.Campared with secure protocol based on secure computation outsourcing(SCO)
CPSTCP is more secure and efficient because it need not share secret.Using attribute-based access control and secure two-party set intersection computation protocol which has been constructed
we construct a ciphertext-based proxy secure two-party set intersection computation protocol which is secure in the semi-honest model.