Volume -I , Issue -X, April 2015

IDENTITY-BASED CONDITIONAL PROXY RE-ENCRYPTION WITHOUT RANDOM ORACLES FOR SECURING BROKERLESS PUBLISH/SUBSCRIBE SYSTEMS

Shagoufta Taskeen , Vidyarani H. J.

Identity-based encryption (IBE) is an important primitive of identity-based cryptography. As such it is a type of public-key encryption in which the public key of a user is some unique information about the identity of the user.In an identity-based proxy re-encryption (IB-PRE) scheme, a semi-trusted proxy can convert a ciphertext under Alice’s identity into a ciphertext for Bob. The proxy does not know the secret key of Alice or Bob, and also does not know the plaintext during the conversion. However, some scenarios require handle a fine-grained delegation. In this paper, by using the identity-based encryption (IBE) technique of Boneh-Boyen, we propose a new identity-based conditional proxy re-encryption (IBCPRE) scheme, which enables Alice to implement fine-grained delegation of decryption rights, and thus is more useful in many applications. Our scheme has significant advantages in both computational and communicational than Shao et al.’s IBCPRE scheme.

peer-to-peer, broker-less, security,identity-based encryption.Proxy re-encryption, Identity-based conditional proxy re-encryption, Bilinear maps.

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