Welcome to the resource topic for 2013/115
Title:
A Conditional Proxy Broadcast Re-Encryption Scheme Supporting Timed-Release
Authors: Kaitai Liang, Qiong Huang, Roman Schlegel, Duncan S. Wong, 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.
ePrint: https://eprint.iacr.org/2013/115
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