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Attribute-Based Encryption with Partially Hidden Encryptor-Specified Access Structures

机译:具有部分隐藏的特定于加密器的访问结构的基于属性的加密

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摘要

We propose attribute-based encryption schemes where encryptor-specified access structures (also called ciphertext policies) are hidden. By using our schemes, an encryptor can encrypt data with a hidden access structure. A decryptor obtains her secret key associated with her attributes from a trusted authority in advance and if the attributes associated with the decryptor's secret key do not satisfy the access structure associated with the encrypted data, the decryptor cannot decrypt the data or guess even what access structure was specified by the encryptor. We prove security of our construction based on the Decisional Bilinear Diffie-Hellman assumption and the Decision Linear assumption. In our security notion, even the legitimate decryptor cannot obtain the information about the access structure associated with the encrypted data more than the fact that she can decrypt the data.
机译:我们提出了基于属性的加密方案,其中隐藏了加密程序指定的访问结构(也称为密文策略)。通过使用我们的方案,加密器可以使用隐藏的访问结构对数据进行加密。解密者预先从受信任的机构获取与其属性关联的秘密密钥,并且如果与解密者的秘密密钥关联的属性不满足与加密数据关联的访问结构,则解密者将无法解密数据甚至无法猜测出哪种访问结构由加密器指定。我们基于决策双线性Diffie-Hellman假设和决策线性假设证明了我们的施工安全性。在我们的安全性概念中,即使合法的解密者也无法获得有关与加密数据相关联的访问结构的信息,而不仅仅是她可以解密数据。

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