Security data retrieval method based on oblivious ciphertext inverted index

The invention discloses a security data retrieval method based on an oblivious ciphertext inverted index. The method comprises the following steps: 1, constructing the oblivious ciphertext inverted index; 2, writing the data into the oblivious ciphertext inverted index; and 3, retrieving the cloud data according to the communication protocol, wherein the step 1 comprises the steps that a cloud obligate random access tree ORAM tree is constructed, a user side buffer area is constructed, a user side keyword hash table is constructed, the cloud obligate random access tree is used for storing a ciphertext inverted index, and the user side buffer area and the user side keyword hash table are used for temporarily storing data; and the step 2 comprises the step of writing the data in the buffer area of the user side into an ORAM tree path of the cloud side through expelling operation. 本发明公开了一种基于不经意密文倒排索引的安全数据检索方法，包括以下步骤：步骤1、构建不经意密文倒排索引；步骤2、将数据写入不经意密文倒排索引中；步骤3、根据通信协议对云端数据进行检索，其中，步骤1包括：构建云端不经意随机访问树ORAM tree、构建用户端缓冲区和构