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Ibraimi, L. and Tang, Qiang and Hartel, P.H. and Jonker, W. (2008) A Type-and-Identity-based Proxy Re-Encryption Scheme and its Application in Healthcare. In: Proceedings of the 5th VLDB Workshop, SDM 2008, August 24, 2008, Auckland, New Zealand. pp. 185-198. Lecture Notes in Computer Science 5159. Springer Verlag. ISBN 978-3-540-85258-2
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Official URL: http://dx.doi.org/10.1007/978-3-540-85259-9_12
Proxy re-encryption is a cryptographic primitive developed to delegate the decryption right from one party (the delegator) to another (the delegatee). In a proxy re-encryption scheme, the delegator assigns a key to a proxy to re-encrypt all messages encrypted with his public key such that the re-encrypted ciphertexts can be decrypted with the delegatee’s private key. We propose a type-and-identity-based proxy re-encryption scheme based on the Boneh-Franklin Identity Based Encryption (IBE) scheme. In our scheme, the delegator can categorize messages into different types and delegate the decryption right of each type to the delegatee through a proxy. Our scheme enables the delegator to provide the proxy fine-grained re-encryption capability. As an application, we propose a fine-grained Personal Health Record (PHR) disclosure scheme for healthcare service by applying the proposed scheme.
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