抗关键词猜测攻击的可搜索属性基加密方案

可搜索属性基加密能够让属性满足访问控制策略(或用来加密关键词的属性满足用户私钥指定的访问控制策略)的用户搜索加密文件。但是,现有的方案不能抵抗关键词猜测攻击。外部攻击者可以生成若干关键词密文上传到云服务器,侦测云服务器将这些密文返回给哪些用户,进而获取这些用户的搜索信息。因此,提出一种可以抵抗关键词猜测攻击的可搜索属性基加密方案。基于DBDH困难问题,该方案在选择安全模型中被证明是选择明文攻击安全的。

A SEARCHABLE ATTRIBUTED-BASED ENCRYPTION SCHEME AGAINST KEYWORD GUESSING ATTACK

Searchable attribute-based encryption enables users whose attributes satisfy the access control strategy(or the attributes used to encrypt keywords to satisfy the access control strategy specified by the users private keys)to search for encrypted files.However,existing schemes cannot resist keyword guessing attacks.External attackers can generate a number of keyword ciphertexts to upload to the cloud server.Then,these ciphertexts are returned to users by detecting the cloud server,and it is possible to know the search information of these users.Therefore,an searchable attribute-based encryption which can resist keyword guessing attacks is proposed.The scheme is proved to be selective plaintext attack security in the selective security model based on the DBDH difficult problem.