Identity-based conditional proxy re-encryption with fine grain policy

Authors

Chunpeng Ge, Nanjing Aeronautics and Astronautics University
Willy Susilo, University of WollongongFollow
Jiandong Wang, Nanjing Aeronautics and Astronautics University
Liming Fang, Nanjing Aeronautics and Astronautics UniversityFollow

RIS ID

111784

Publication Details

Ge, C., Susilo, W., Wang, J. & Fang, L. (2017). Identity-based conditional proxy re-encryption with fine grain policy. Computer Standards and Interfaces, 52 1-9.

Abstract

2017 Elsevier B.V.An identity-based conditional proxy re-encryption scheme (IB-CPRE) allows a semi-trusted proxy to convert a ciphertext satisfying one condition, which is set by the delegator, under one identity to another without the necessity to reveal the underlying message. In ICISC 2012, Liang, Liu, Tan, Wong and Tang proposed an IB-CPRE scheme, and left an open problem on how to construct chosen-ciphertext secure IB-CPRE supporting OR gates on conditions. In this work, we answer this aforementioned problem by constructing an identity-based conditional proxy re-encryption scheme with fine grain policy (IB-CPRE-FG). In an IB-CPRE-FG scheme, each ciphertext is labeled with a set of descriptive conditions and each re-encryption key is associated with an access tree that specifies which type of ciphertexts the proxy can re-encrypt. Furthermore, our scheme can be proved secure against adaptive access tree and adaptive identity chosen-ciphertext attack.