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Plaintext-Checkable Encryption with Unlink-CCA Security in the Standard Model

机译:明文 - 在标准型号中具有锁定CCA安全性的明文

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Plaintext-Checkable Encryption (PCE) was first proposed by Canard et al. to check whether a ciphertext encrypts a given plaintext under the public key. This primitive is very useful in many applications, e.g., search on encrypted database and group signature with verifier-local revocation (GS-VLR). In the literature, existing PCE schemes only satisfies unlink notion that defines the adversary to get information about whether two challenge ciphertexts share the same plaintext or not, without given the challenge plaintexts. Using the tool of pairing-friendly smooth projective hash function (PF-SPHF), we propose the first PCE construction with the most desirable unlink-cca notion, which is stronger than unlink by additionally providing a decryption oracle. We prove it in the standard model based on the hard subset membership problem. Finally, by instantiating SPHF from DDH assumption, we obtain a PCE instantiation from SXDH assumption and show that it achieves not only the desired security but also efficient test computation complexity. Hence it will be very useful in practical applications.
机译:明文 - 可审查的加密(PCE)是由Canard等人提出的。检查CipherText是否在公钥下加密给定的明文。该原语在许多应用中非常有用,例如,使用验证者 - 本地撤销(GS-VLR)搜索加密数据库和组签名。在文献中,现有的PCE方案只能满足不链接的概念,这些概念定义了对攻击性的信息,以获取有关两个挑战密文是否共享相同明文的信息,而不会给予挑战明文。使用配对友好的光滑投影散列功能(PF-SPHF)的工具,我们提出了具有最理想的未链接-CCA概念的第一个PCE结构,这比另外提供解密甲骨文更强大。我们根据硬子集隶属问题在标准模型中证明它。最后,通过将SPHF从DDH假设中实例化,我们获得了从SXDH假设的PCE实例化,并表明它不仅可以实现所需的安全性,而且实现了高效的测试计算复杂性。因此,在实际应用中将非常有用。

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