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Conditional Identity‐Based Broadcast Proxy Re‐Encryption and Its Application to Cloud Email
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Conditional Identity‐Based Broadcast Proxy Re‐Encryption and Its Application to Cloud Email

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Conditional Identity-Based Broadcast Proxy Re-Encryption and Its Application to Cloud Email

In order to achieve the flexible applications, a number of extended Proxy Re-Encryptions (PRE), e.g. Conditional (CPRE), identity-based PRE (IPRE) and broadcast PRE (BPRE) have been proposed. By incorporating CPRE, IPRE and BPRE, the proposed system proposes a versatile primitive referred to as conditional identity-based broadcast PRE (CIBPRE) and formalizes its semantic security.

CIBPRE allows a sender to encrypt a message to multiple receivers by specifying the receivers’ identities, and the sender can delegate a re-encryption key to a proxy so that he/she can convert the initial cipher text into a new one to a new set of intended receivers.

Moreover, the re-encryption key can be associated with a condition such that only the matching cipher texts can be re-encrypted, which allows the original sender to enforce access control over his remote cipher texts in a fine-grained manner. The system proposes an efficient CIBPRE scheme with security confirmation.

In the instantiated scheme, the initial cipher text, the re-encrypted cipher text and the re-encryption key are all in constant size, and the parameters to generate a re-encryption key are independent of the original receivers of any initial cipher text. Based on the Pretty Good privacy protocol and identity based encryption the proposed CIBPRE system provides a secured cloud email system over existing secure email systems.

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