Lecture Notes in Computer Science, 2008, Volume 5159/2008, 185-198, DOI: 10.1007/978-3-540-85259-9_12

A Type-and-Identity-Based Proxy Re-encryption Scheme and Its Application in Healthcare

Luan Ibraimi, Qiang Tang, Pieter Hartel and Willem Jonker

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Abstract

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.

Keywords  Proxy re-encryption - Identity-Based Encryption - Personal Health Record

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