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Revocable Identity Based Signature Scheme with Outsourced Cloud Revocation Authority

In last few years, many aspects of Identity based Cryptosystems (IBC) were studied because it has a critical feature of avoiding high overheads linked with management of public key certificate. But the one issue associated with it how to revoke defiant user remains open. Many schemes were proposed to overcome this problem. One move towards revocation in identity based settings was taken by introducing the key generation centre (KGC) which updates users’ private key periodically. But with this move, computation work on KGC will increase quickly with increasing number of users. We have proposed an ID based signature scheme (IBS) with outsourced cloud revocation authority (CRA). In this scheme, the revocation functionality is outsourced to a CRA. We have described the system framework of the scheme as well as its security model with complete security analysis.