A Conditional Proxy Broadcast Re-Encryption Scheme Supporting Timed-Release

Kaitai Liang; Qiong Huang; Roman Schlegel; Duncan S.  Wong; Chunming Tang

Paper 2013/115

A Conditional Proxy Broadcast Re-Encryption Scheme Supporting Timed-Release

Kaitai Liang, Qiong Huang, Roman Schlegel, Duncan S. Wong, and Chunming Tang

Abstract

To allow a delegator not only to delegate the keyword-controlled decryption rights of a broadcast encryption to a set of specified recipi- ents, but also to control when the decryption rights will be delegated, in this paper, for the first time, we introduce a new notion called Timed- Release Conditional Proxy Broadcast Re-Encryption (TR-CPBRE). We also propose a concrete construction for TR-CPBRE which can be proven selective identity adaptive CCA secure under the (P; Q; f)-general de- cisional Diffie-Hellman exponent assumption, and chosen-time period chosen-ciphertext secure under the bilinear Diffie-Hellman assumption. When compared with the existing CPBRE and Timed-Release Proxy Re-Encryption (TR-PRE) schemes, our scheme achieves better efficiency, and enables the delegator to make a fine-grained delegation of decryption rights to multiple delegatees.

Metadata

Available format(s): PDF
Publication info: Published elsewhere. Unknown where it was published
Keywords: timed-release encryption bilinear map.
Contact author(s): kliang4-c @ my cityu edu hk
History: 2013-05-06: last of 4 revisions; 2013-02-27: received; See all versions
Short URL: https://ia.cr/2013/115
License: CC BY

BibTeX

@misc{cryptoeprint:2013/115,
      author = {Kaitai Liang and Qiong Huang and Roman Schlegel and Duncan S.  Wong and Chunming Tang},
      title = {A Conditional Proxy Broadcast Re-Encryption Scheme Supporting Timed-Release},
      howpublished = {Cryptology {ePrint} Archive, Paper 2013/115},
      year = {2013},
      url = {https://eprint.iacr.org/2013/115}
}