Abstract:

The traditional PEKS enables users to search data by using keyword in the condition of encryption. But this scheme needs the security channel and its trapdoor was proved to be unsafe. It greatly reduces the effectiveness of the system. In this paper, we propose a scheme to achieve three targets. First, we use the server’s public key to encrypt the keywords and data, outside attackers have no server’s private key, he will not obtain any information of the keyword cipher texts, and we can use public channel to transport PEKS. Secondly, we put forward an indistinguishable trapdoor scheme; outside attackers can’t use the keyword guessing attack against the trapdoor. Third, our scheme not only supports accurate keyword search encryption, it also supports the search when the keywords which are input have any spelling mistake or format inconsistent situations and has greatly improved the availability of the system. We will prove that our scheme is safe and meet the character of the private protection.

Key words: cloud computing, public encryptionsearch, fuzzy, trapdoor