Hierarchical conditional proxy re-encryption

Authors:
Liming Fang;Willy Susilo;Chunpeng Ge;Jiandong Wang
Affiliations:
College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China;Centre for Computer and Information Security Research, School of Computer Science and Software Engineering, University of Wollongong, Australia;College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China;College of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing, China
Venue:
Computer Standards & Interfaces
Year:
2012

Citing 17
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Abstract

In this paper, we introduce a new primitive called hierarchical conditional proxy re-encryption (HC-PRE) that enhances the concept of C-PRE by allowing more general re-encryption key delegation patterns. Hierarchical conditional proxy re-encryption (HC-PRE) scheme is the hierarchical extension of conditional proxy re-encryption (C-PRE) where the condition is a vector of keywords. We present an efficient construction of hierarchical key derivation C-PRE scheme where the ciphertext length is independent from the depth of the hierarchy. We further extend our work by presenting a more generalized key delegation, by allowing the use of a wildcard in the keyword vector.