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Efficient chosen-ciphertext secure public-key encryption scheme with high leakage-resilience

机译:高泄漏弹性的高效选择密文安全公钥加密方案

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A leakage-resilient public-key encryption (PKE) scheme provides security even if an adversary obtains some information on the secret key. In recent years, much attention has been focused on designing provably secure PKE in the presence of key-leakage and almost all the constructions rely on an important building block namely hash proof system (HPS). However, in the setting of adaptive chosen-ciphertext attacks (CCA2), there are not many HPS-based leakage-resilient PKE schemes available. Moreover, most of them have an unsatisfactory leakage rate. In this study, the authors propose a new method of constructing leakage-resilient CCA2-secure PKE scheme from any tag-based strongly universal HPS. The striking advantage of the authors scheme is the leakage rate, which is the best one among all known HPS-based indistinguishability key leakage CCA2-secure constructions. In particular, they present an instantiation under the -linear assumption. In the cases of = 1 (resp. = 2), they actually obtain a decisional Diffie–Hellman (DDH)-based [resp. decisional linear (DLIN)-based] PKE scheme, where the leakage rate can be made to 1/4 (resp. 1/6). The authors DDH-based scheme achieves the best leakage rate among all known DDH-based (Cramer–Shoup-type) schemes. Their DLIN-based scheme is the first one that can achieve leakage of /6 bits without pairing, where is the length of the secret key.
机译:即使对手获得了有关秘密密钥的某些信息,防泄漏弹性的公共密钥加密(PKE)方案仍可提供安全性。近年来,在存在密钥泄漏的情况下,人们将许多注意力集中在设计可证明安全的PKE上,并且几乎所有构造都依赖于重要的构造块,即哈希证明系统(HPS)。但是,在设置自适应选择密文攻击(CCA2)的情况下,基于HPS的防泄漏弹性PKE方案不多。而且,它们中的大多数泄漏率不令人满意。在这项研究中,作者提出了一种从任何基于标签的强通用HPS构造防泄漏CCA2安全PKE方案的新方法。作者方案的显着优势是泄漏率,这是所有已知的基于HPS的可区分性关键泄漏CCA2安全构造中最好的一种。特别是,它们在-线性假设下呈现了一个实例。在= 1(resp。= 2)的情况下,他们实际上获得了基于决策Diffie-Hellman(DDH)的[resp。基于决策线性(DLIN)的PKE方案,其中泄漏率可以设为1/4(分别为1/6)。作者基于DDH的方案在所有已知的基于DDH的(Cramer–Shoup型)方案中均实现了最佳的泄漏率。他们基于DLIN的方案是第一个可以实现/ 6位泄漏而无需配对的方案,这是密钥的长度。

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