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Tang, Qiang and Hartel, P.H. and Jonker, W.
(2009)
Inter-domain Identity-Based Proxy Re-encryption.
In: Information Security and Cryptology, 4th International Conference (Inscrypt), December 14-17, 2008, Beijing China.
pp. 332-347.
Lecture Notes in Computer Science 5487.
Springer Verlag.
ISBN 978-3-642-01439-0
Full text available as:
Official URL: http://dx.doi.org/10.1007/978-3-642-01440-6_26  AbstractProxy re-encryption is a cryptographic primitive developed to delegate the decryption right from one party (the delegator) to another (the delegatee). So far, research efforts have only been devoted to the intra-domain setting, where the delegator and the delegatee are registered in the same domain. In this paper, we investigate the proxy re-encryption in the inter-domain setting, where the delegator and the delegatee are from different domains, and focus on the identity-based case. We analyze the trust relationships and possible threats to the plaintext privacy, and provide rigorous security definitions. We propose a new inter-domain identity-based proxy re-encryption scheme and prove its security in our security model. An interesting property of the proposed scheme is that, to achieve the chosen plaintext security for the delegator, the delegatee’s IBE only needs to be one-way.
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