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Delegate Predicate Encryption and Its Application to Anonymous Authentication

机译:委托谓词加密及其在匿名认证中的应用

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Predicate encryption provides fine-grained control over encryption and decryption. In a predicate encryption scheme, message is encrypted with a set of attributes, and decryption key is incorporated with a predicate. Only when the predicate evaluates to true over these attributes, the message can be correctly decrypted. We propose an extension to predicate encryption named delegate predicate encryption. In our extension, a user generates a encryption capability of a set of attributes, then sends the capability to a encryption proxy. Using this capability, the proxy can encrypt arbitrary message with these attributes without knowing anything about these attributes. We give a concrete construction from a predicate encryption scheme which supports the widest range of predicate known to date. Then, using our extension, we are able to construct an anonymous authentication scheme. In our anonymous authentication scheme, authentication rules can be described in an very expressive way, while the anonymity of user is protected and the authentication rules are also hidden.
机译:谓词加密提供对加密和解密的细粒度控制。在谓词加密方案中,消息用一组属性加密,解密密钥与谓词合并。仅当谓词对这些属性的评估为真时,才可以正确解密消息。我们提议谓词加密的扩展名为委托谓词加密。在我们的扩展中,用户生成一组属性的加密功能,然后将该功能发送到加密代理。使用此功能,代理可以在不了解这些属性的情况下,使用这些属性对任意消息进行加密。我们从谓词加密方案给出了一种具体的构造,该方案支持迄今为止已知的最广泛的谓词。然后,使用我们的扩展,我们可以构造一个匿名身份验证方案。在我们的匿名身份验证方案中,可以以一种非常具有表现力的方式描述身份验证规则,同时保护用户的匿名性并隐藏身份验证规则。

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