标准模型下增强的无需安全信道的带关键词搜索的公钥加密

Secure Channel Free Searchable Encryption in Standard Model

Baek,Safavi-Naini和Susilo提出了无需安全信道的带关键词搜索的公钥加密方案。该方案中的安全模型限制了攻击者的能力,并且方案是在随机预言模型下可证安全的。然而在随机预言模型下证明安全的方案在实际执行中会导致不安全。通过改进安全模型使得攻击者能力更强,即允许攻击者获得非挑战密文和陷门之间的关系,同时构造了在增强的安全模型下不使用随机预言机可证安全的带关键词搜索的公钥加密方案。

Recently,Baek et al. proposed an efficient public key encryption scheme with keyword search based on the scheme of Boneh et al. However, the security model of Baek et al. seriously limits the ability of the adversary. Rhee et al. enhanced the security model of the public key encryption with keyword search to properly incorporate the ability of an adversarys,and presented a PEKS in the random oracle model. Unfortunately, a proof in the random oracle model has shown that it possibly leads to insecure schemes when the random oracles are implemented in the standard model. This paper constructed an efficient public key encryption scheme with keyword search secure in the enhanced security model without random oracle.