New identity-based proxy re-encryption schemes to prevent collusion attacks

Authors:
Lihua Wang;Licheng Wang;Masahiro Mambo;Eiji Okamoto
Affiliations:
Information Security Research Center, National Institute of Information and Communications Technology, Tokyo, Japan;Information Security Research Center, National Institute of Information and Communications Technology, Tokyo, Japan and Information Security Center, Beijing University of Posts and Telecommunicati ...;Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Japan;Graduate School of Systems and Information Engineering, University of Tsukuba, Tsukuba, Japan
Venue:
Pairing'10 Proceedings of the 4th international conference on Pairing-based cryptography
Year:
2010

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Abstract

In this paper, we propose two new constructions of identity-based proxy re-encryption (IB-PRE). The most important feature of our schemes is that we no longer need the semi-trust assumption on the proxy. Moreover, we describe the IND-PrID-CCA/CPA security models for an IB-PRE in a single-hop scenario, and then give a general analysis on the relationship between the IND-PrID-CPA security model and the desirable PRE properties: unidirectionality, collusion "safeness" and nontransitivity. Our first scheme has no ciphertext expansion through the re-encryption and is proven IND-PrID-CPA secure in the random oracle model. The second one achieves the IND-PrID-CCA security.