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A Proxy RE-encryption (PRE) scheme supports the delegation of decryption rights via a proxy, who makes the ciphertexts de-cryptable by the delegatee. PRE is useful in various applications such as encrypted email forwarding. In this paper, the authors introduce a more generalized notion of Conditional Proxy Broadcast RE-encryption (CPBRE). A CPBRE scheme allows Alice to generate a re-encryption key for some condition specified during the encryption, such that the re-encryption power of the proxy is restricted to that condition only. This enables a more fine-grained delegation of decryption right. Moreover, Alice can delegate decryption rights to a set of users at a time. That is, Alice's ciphertexts can be re-broadcasted.
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