Abstract

In the era of cloud computing, public key encryption with keyword search (PEKS) is an extremely useful cryptographic tool for searching on encryption data, whose strongest security notion is indistinguishability encryption against chosen ciphertext attack (ind-cca). Adballa et al. presented a transformation from identity based encryption (IBE) to PEKS in the Theory of Cryptography Conference 2010. This paper proposes a new framework of ind-cca secure PEKS in the standard model. Our main technical tool is a newly introduced notion of smooth projective hash function with key mapping, in which the hash key hk is mapped into another mapping projection key mhp besides the classical projection key hp. Finally, we provide an instantiation of our framework based on symmetric eXternal Diffie–Hellman assumption.

中文翻译：

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带有关键字搜索的IND-CCA安全公钥加密的新框架

摘要

在云计算时代，带有关键字搜索的公钥加密（PEKS）是用于搜索加密数据的极其有用的加密工具，其最强的安全性概念是针对选定密文攻击（ind-cca）的不可区分性加密。Adballa等。在2010年密码学会议上提出了从基于身份的加密（IBE）到PEKS的转换。本文提出了标准模型中的ind-cca安全PEKS的新框架。我们的主要技术工具是新引入的带有键映射的光滑投影哈希函数概念，其中将哈希键hk映射到除经典投影键hp之外的另一个映射投影键mhp。最后，我们基于对称的外部Diffie-Hellman假设提供了我们框架的实例化。