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A distributed ciphertext index slice retrieval method in cloud environment

A distributed, cloud environment technology, applied in the field of full-text retrieval, can solve the problems that affect the efficiency of data retrieval, cannot take into account the security and efficiency of data retrieval at the same time, and achieve the effect of improving retrieval efficiency

Active Publication Date: 2021-06-22
NANJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although it can solve the retrieval problem of ciphertext data to a certain extent, the characteristics of data encryption retrieval seriously affect the efficiency of data retrieval under the premise of ensuring data security.
[0003] Although the existing retrieval schemes can improve the efficiency of data retrieval in the cloud environment to a certain extent, they cannot guarantee the security of data retrieval in the cloud environment on the basis of improving retrieval efficiency.
The characteristics of data retrieval and data encryption lead to the inability of existing retrieval schemes to take into account the security and retrieval efficiency of data retrieval at the same time

Method used

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  • A distributed ciphertext index slice retrieval method in cloud environment
  • A distributed ciphertext index slice retrieval method in cloud environment
  • A distributed ciphertext index slice retrieval method in cloud environment

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Embodiment Construction

[0050] The implementation of the technical solution of the present invention will be described in further detail below in conjunction with the accompanying drawings:

[0051] Data retrieval is an important way to obtain information. In order to ensure the security of data retrieval in the cloud environment, data encryption retrieval is a common method. Although the feature of data encryption retrieval ensures data security, it seriously affects the efficiency of data retrieval.

[0052] Aiming at the efficiency of ciphertext index retrieval, the distributed ciphertext index slice retrieval method in the cloud environment based on inverted index segmentation of the present invention, the specific processing methods include data preprocessing, inverted index construction, data and index encryption, Index segmentation, sub-index matching, data retrieval, result set merging, and data decryption are eight steps. Through these eight steps, the retrieval efficiency of ciphertex...

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Abstract

A distributed ciphertext index slice retrieval method in a cloud environment of the present invention comprises the following steps: data preprocessing; sequentially scanning the token term set, and dividing it into a plurality of token term sub-sets according to the term in the token term information, Build dictionary T, posting list file L and inverted index Ω; encrypt data and index; split and distribute ciphertext index: calculate splitting scheme, split dictionary and inverted file; distribute sub-index; sub-index match; key Word retrieval; merging of result sets; data decryption: After receiving the ciphertext data returned by the server, the user decrypts and obtains a plaintext retrieval result set. The invention realizes efficient retrieval of ciphertext data.

Description

technical field [0001] The invention relates to a method for retrieving distributed ciphertext index slices in a cloud environment, and belongs to the technical field of full-text retrieval. Background technique [0002] Data retrieval is an important way to obtain information. Facing the rapidly increasing amount of data, individuals and enterprises tend to store data in the cloud. At the same time, a large amount of data makes it necessary to continuously improve the efficiency of retrieval in the process of retrieval, so as to obtain information data quickly. In order to ensure the privacy of data, more and more enterprises and individual users choose to encrypt data and store the data in ciphertext on cloud servers. In order to solve the problem of ciphertext data retrieval in the cloud environment, data encryption retrieval technology continues to develop. Although it can solve the retrieval problem of ciphertext data to a certain extent, the characteristics of data ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/62G06F21/60G06F16/33G06F16/31
CPCG06F21/602G06F21/6227
Inventor 杨庚戴厚乐闵兆娥刘国秀
Owner NANJING UNIV OF POSTS & TELECOMM