计算机工程

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指定使用者的多服务器多关键字可搜索加密方案

  

  • 发布日期:2020-12-15

Multi-server multi-keyword searchable encryption scheme for designated user

  • Published:2020-12-15

摘要: 针对现有可搜索加密方案中密文检索效率低、搜索结果不精确和不支持验证数据使用者身份等问题,在无证书密码体制下,提出了一种指定使用者的多服务器多关键字可搜索加密方案。首先,方案使用多服务器和多关键字技术在降低服务器负荷的同时提高了用户检索密文的速度,使搜索结果更加精确;其次,在搜索验证阶段,搜索服务器验证数据使用者的身份,若身份合法,存储服务器根据关键词向数据使用者返回相应密文;最后,在随机预言模型下,证明方案抵抗无证书密码体制下两类攻击者的内外关键字猜测攻击。性能分析结果表明,与黄及王等人提出的公钥可搜索加密方案相比,新方案能够在降低计算开销代价的同时提高搜索效率,在安全和效率方面都具备一定的优势。 关键词:可搜索加密;多服务器;多关键字;指定使用者;内外关键字猜测攻击

Abstract: In order to solve the problems of low efficiency of ciphertext retrieval, inaccurate search results and failure to verify the identity of data users in the existing searchable encryption schemes, a multi-server multi-keyword searchable encryption scheme for designated user is proposed under certificateless cryptosystem. Firstly, the scheme uses multi-server and multi-keyword technology to reduce the server load and improve the speed of users to retrieve ciphertext and make the search results more accurate. Secondly, in the search verification phase, the search server verifies the identity of the data user. If the identity is legal, the storage server returns the corresponding ciphertext to the data user according to the keyword. Finally, under the random prophecy model, it is proved that the scheme can resist the inside and outside keyword guessing attacks under certificateless cryptosystem. The results of performance analysis show that compared with the public key searchable encryption scheme proposed by Huang and Wang, the new scheme can not only reduce the computational cost but also improve the search efficiency, and has certain advantages in security and efficiency.