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中文摘要：
在可搜索加密的云服务中，数据拥有者往往更希望将数据文件以密文的形式分别存储到多个云服务器，从而提高授权用户对云端数据的检索效率以及对大型数据的处理能力。基于此，该文提出一种基于云存储的多服务器多关键词多用户可搜索加密方案，该方案被证明是IND-CKA（adaptive Chosen Keyword Attack）安全的，且同时具备关键词陷门的安全性。相对于单服务器可搜索加密，该方案在保证数据机密性的前提下能够对其进行高效检索，并能够在关键字索引中不完全包含所检索的多个关键词或者不存在某个文件包含所有被检索的多个关键词的情况下，更精确地进行检索。
英文摘要：
In the searchable encryption services provided by cloud severs, data owners expect that their data files can be partitioned and stored to multiple cloud severs with the form of ciphertext, so as to improve the searching efficiency of authorized users and the processing ability of big data. For this issue, a multi-sever multi-keyword searchable encryption scheme is proposed based on cloud storage, and the proposed scheme is proved to be IND-CKA （adaptive Chosen Keyword Attack） secure coexisting with the secure trapdoor. Compared with the single sever searchable encryption, the proposed scheme can not only guarantee the data security, but also provide more accurate retrieval service when the keyword index or any one file does not contain all of the searching keywords.
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