IDENTITY BASED ENCRYPTION

摘要

Method and system for identity based encryption are described. The method comprises obtaining public parameters and a public key set from a central server, where the public parameters include a friendly prime, a torsion group prime order, an super-singular elliptic curve, a first torsion group, a pre-computed Tate pairing value, a first elliptic curve point and a second elliptic curve point, and a distortion map, and where the pre-computed Tate pairing value is generated by the central server. Further, a receiver key set of elliptic curve points based on a receiver identity of a receiver is determined, where the receiver key set is a subset of the public key set. Further a receiver public key based on the receiver key set is computed. Further, the data is encrypted using the Tate pairing value and an encryption component, wherein the encryption component is computed based on the receiver public key set.