SECURED EMAIL BROADCASTING USING IDENTITY BASED ENCRYPTION

Computer Engineering

Identity based proxy encryption is based on Proxy Re-encryption (PRE). It formalizes semantic security. The number of extended proxy re-encryption schemes have been proposed such as conditional identity based PRE (CIBPRE), Broadcast PRE (BPRE). Conditional IBPRE allows sender to encrypt message and send it to multiple users or receivers by specifying their identities. Data encryption keys are given to proxy server by which proxy can re-encrypt into new one and predetermined receivers. Furthermore, re-encryption keys are associated with some condition is such way by matching ciphertexts can be re-encrypted. With proposed approach sender can enforce his control on his remote ciphertexts in a fine-grained manner. Proposed CIBPRE is provable secured as ciphertexts get re-encrypted and its keys are of constant size. Along with CIBPRE scheme, email broadcasting with group of user is contributed. It decreases the time required for data encryption as well as re-encryption. With experimental results we have to show that the proposed system is time efficient as compared to previous system.

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