Title: Broadcast revocation scheme in composite-order bilinear group and its application to attribute-based encryption

Authors: Qinyi Li; Hu Xiong; Fengli Zhang

Addresses: School of Computer Science and Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Avenue, Chengdu, 611731, China ' School of Computer Science and Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Avenue, Chengdu, 611731, China ' School of Computer Science and Engineering, University of Electronic Science and Technology of China, No.2006, Xiyuan Avenue, Chengdu, 611731, China

Abstract: Broadcast revocation scheme allows a broadcaster to specify a revoked users list S in the broadcast ciphertext. Only the users outside S can decrypt the broadcast ciphertext. Attribute-Based Encryption (ABE) is a useful cryptographic primitive which enables flexible access policy over encrypted data. In this paper, we propose an adaptively secure broadcast revocation scheme in composite-order bilinear group. After that, a fully secure and efficient broadcast revocable ciphertext-policy ABE scheme has been constructed based on the original revocation scheme. The security of the two encryption schemes can be proved through the famous dual system encryption methodology and reduced to the same three static intractable assumptions. Furthermore, our revocable ciphertext-policy ABE scheme enjoys fully collusion resistance and unbounded users revocation.

Keywords: broadcast revocation; attribute-based encryption; composite-order bilinear group; dual system encryption; ciphertext policy; fully secure; cryptography; security.

DOI: 10.1504/IJSN.2013.055036

International Journal of Security and Networks, 2013 Vol.8 No.1, pp.1 - 12

Received: 12 Oct 2012
Accepted: 19 Jan 2013
Published online: 12 Jul 2013 *

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