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Efficiently Obfuscating Re-Encryption Program Under DDH Assumption

机译:在DDH假设下有效地混淆重新加密程序

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The re-encryption functionality transforms a ciphertext encrypted under a public key pk to a ciphertext of the same message encrypted under a different public key pk_1. Hohenberger et al. (TCC 2007) proposed a pairing-based obfuscator for the family of circuits implementing the re-encryption functionality under a new notion of obfuscation called as average-case secure obfuscation. Chandran et al. (PKC 2014) proposed a lattice-based construction for the same. The construction given by Hohenberger et al. could only support polynomial sized message space and the proof of security relies on strong assumptions on bilinear groups. Chandran et al.'s construction could only satisfy a relaxed notion of correctness. In this work, we propose a simple and efficient obfuscator for the re-encryption functionality that satisfies the strongest notion of correctness, supports encryption of messages from an exponential sized domain and relies on the standard DDH-assumption. This is the first construction that does not rely on pairings or lattices. All our proofs are in the standard model.
机译:重新加密功能将在公共密钥pk下加密的密文转换为在不同的公共密钥pk_1下加密的同一消息的密文。 Hohenberger等。 (TCC 2007)提出了一种基于配对的混淆器,用于在新的混淆概念(平均情况下安全混淆)下实现重新加密功能的电路系列。 Chandran等。 (PKC 2014)提出了基于网格的构造。 Hohenberger等人给出的构造。只能支持多项式大小的消息空间,并且安全性证明依赖于对双线性组的强假设。 Chandran等人的结构只能满足宽松的正确性概念。在这项工作中,我们为重新加密功能提出了一种简单有效的混淆器,该混淆器满足最强的正确性概念,支持来自指数大小域的消息加密,并依赖于标准DDH假设。这是不依赖于配对或晶格的第一种构造。我们所有的证明都在标准模型中。

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