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File segmenting method based on digital abstract

A digital summary and file segmentation technology, applied in the field of data security, can solve the problems of large files and difficulty in guaranteeing algorithm performance, and achieve the effects of improving efficiency, realizing data integrity verification, and reducing calculation and time overhead

Inactive Publication Date: 2016-07-20
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Based on the consideration of data confidentiality, the key or a small part of the ciphertext is encrypted symmetrically; in order to realize complex functions such as digital signature and access control, the encryption algorithm of the public key system is introduced, but the outsourced storage files are relatively large, so the performance of the algorithm Difficult to be guaranteed; based on integrity considerations, a hash algorithm is introduced to achieve integrity verification

Method used

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  • File segmenting method based on digital abstract
  • File segmenting method based on digital abstract
  • File segmenting method based on digital abstract

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Step 1: Select the MD5 hash algorithm to perform a hash on the file to obtain a 128-bit binary hash value of the file;

[0026] Step 2: divide the file into several blocks of the same size, the size of the file block is fixed at 0.5KB, and the number of file blocks is determined by the size of the file to be sent: assuming that the file size is N, and the number of files is m, then m=2N; then Label the decomposed small file blocks in a named manner;

[0027] Step 3: Divide the marked file blocks into 128 groups, then the number of each group is g=m / 128, and extract the small file blocks according to the hash content: if the bit is 1, take out the first one of the group Element; if the bit is 0, it will not be fetched. After the above process, two collections with different file blocks will be formed; respectively merging the two collections will result in a larger packaged file and a smaller extracted file.

[0028] Step 4: The encapsulated file can be directly stored...

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PUM

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Abstract

The invention discloses a file segmenting method based on a digital abstract. The algorithm mainly comprises a digital abstract module, a file segmenting module and a file recombination module, wherein the digital abstract module extracts and converts file digital abstract, the file segmenting module converts the file into a plurality of file blocks with same size sequentially, and the file recombination module recombines different file blocks into two files. The digital abstract serves as file extraction basis. Data confidentiality is ensured, and data integrity verification can be completed. The file segmenting method is applicable to file outsourcing storage.

Description

technical field [0001] The invention relates to the field of data security, in particular to a method for extracting files. Background technique [0002] With the advent of the era of big data, the rise of the mobile Internet and the widespread use of mobile smart terminals, the storage requirements of enterprises and individual users continue to expand, gradually exceeding the storage capabilities of enterprises and individual users. The outsourced storage service based on cloud computing provides an ideal solution for users' storage demand gap. However, the data or files stored outsourced are out of the direct control of the user, which seriously threatens their security and privacy. In order to protect the security and privacy of users' outsourced storage data, it is usually necessary to encrypt the outsourced stored data or files and implement strict access control. In order to facilitate the sharing of data or files, the current access control of outsourced storage da...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06H04L9/32H04L9/00H04L29/06H04L29/08
CPCH04L9/002H04L9/0625H04L9/0643H04L9/3239H04L63/0442H04L67/1097
Inventor 陈伟王燚刘鑫忠
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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