Cryptology ePrint Archive: Report 2017/059

Adaptively Secure Recipient Revocable Broadcast Encryption with Constant size Ciphertext

Kamalesh Acharya and Ratna Dutta

Abstract: In this paper, we put forward the first adaptively secure recipient revocable broadcast encryption (RR-BE) scheme in the standard model. The scheme is adaptively secure against chosen plaintext attack (CPA) under the q-weaker Decisional Augmented Bilinear Diffie-Hellman Exponent (q-wDABDHE) assumption. Our scheme compares well with the only existing RR-BE scheme of Susilo et al. which is selectively secure in the random oracle model. More interestingly, achieving adaptive security in the standard model does not blow up the communication cost in our construction. To be more precise, the size of the ciphertext which is broadcasted by the broadcaster is constant.

Category / Keywords: public-key cryptography / recipient revocable broadcast encryption, chosen plaintext attack, adaptive security.

Date: received 26 Jan 2017

Contact author: kamaleshiitkgp at gmail com

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Version: 20170131:151451 (All versions of this report)

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