Lightweight outsourced file multi-keyword retrieval method and system with privacy protection
A privacy protection and package file technology, which is applied in the field of information security cryptography, can solve problems such as low retrieval efficiency, long solution time, unsuitable computing power, etc., and achieve the effect of improving retrieval efficiency and enhancing search experience
Active Publication Date: 2021-08-27
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology
The existing technology mainly uses the matrix encryption scheme, but the larger the dimension of the matrix, the longer the solution time, the lower the retrieval efficiency, and it is not suitable for devices with weak computing power, so the search experience for users is not very good.
Method used
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[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.
[0042] see Figure 1 to Figure 2 , the present invention provides a lightweight outsourced file multi-keyword retrieval method with privacy protection, comprising:
[0043] S101. Acquire system security parameters and anti-collision hash functions, and generate system public parameters.
[0044] Specifically, multiple system security parameters λ are input in the system initialization module 1 1 ,λ 2 ,λ 3 ,λ 4 , and randomly select a length as the second system security parameter λ 2 The first largest prime number p and a c...
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The invention discloses a lightweight outsourced file multi-keyword retrieval method and system with privacy protection. Keys are generated according to system public parameters, and a plurality of keywords form a keyword dictionary. For each outsourced file, according to the file content and The keyword dictionary constructs the file index vector, encrypts the file index vector with the key, and obtains the ciphertext index vector, and then outsources it to the cloud server. When searching, constructs the query vector according to the query keyword and the keyword dictionary, and encrypts it with the key After transformation, the ciphertext retrieval trapdoor is obtained, and a similarity threshold is preset, and submitted to the cloud server, so that the cloud server can only perform data retrieval according to the ciphertext retrieval trapdoor in ciphertext form, when according to the ciphertext index vector and ciphertext When the similarity calculated by the text retrieval trapdoor exceeds the preset similarity threshold, the retrieved outsourced data is returned to the user, which improves retrieval efficiency and improves the search experience of users with weak device clients.
Description
technical field [0001] The invention relates to the technical field of information security cryptography, in particular to a lightweight outsourced file multi-keyword retrieval method and system with privacy protection. Background technique [0002] With the advent of the big data era, cloud computing technology has become a research hotspot. Cloud computing has the ability to store large amounts of data and perform flexible operations, so individuals and businesses can outsource their data to cloud servers. However, there are security issues with outsourced data. Once the data is successfully uploaded to the cloud server, the user loses control over the data. For outsourced data, in order to facilitate later retrieval and access by users, the user needs to generate the corresponding ciphertext index before uploading, and store the ciphertext index and data together on the cloud server. When some outsourced data needs to be accessed, the cloud server can return relevant fi...
Claims
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IPC IPC(8): G06F21/60G06F21/62G06F16/14
CPCG06F21/602G06F21/6227G06F16/148
Inventor 刘林刚王玉珏丁勇赵萌
Owner GUILIN UNIV OF ELECTRONIC TECH