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Identity-based conditional proxy re-encryption
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<p>Identity-based conditional proxy re-encryption (IBCPRE) is a type of <a href="/facts/Proxy_re-encryption/YYqkV3dk">proxy re-encryption</a> (PRE) scheme in the <a href="/facts/Identity-based_security/1Ykx2vGE">identity-based public key cryptographic setting</a>. An IBCPRE scheme is a natural extension of proxy re-encryption on two aspects. The first aspect is to extend the proxy re-encryption notion to the identity-based public key cryptographic setting. The second aspect is to extend the feature set of proxy re-encryption to support conditional proxy re-encryption. By conditional proxy re-encryption, a proxy can use an IBCPRE scheme to re-encrypt a <a href="/facts/Ciphertext/luNTs4sY">ciphertext</a> but the ciphertext would only be well-formed for decryption if a condition applied onto the ciphertext together with the re-encryption key is satisfied. This allows fine-grained proxy re-encryption and can be useful for applications such as secure sharing over encrypted cloud data storage. </p>