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Method and device for file encryption

A file encryption and file technology, applied in digital data protection and other directions, can solve problems such as malicious attacks, inability to form random mappings, and poor algorithm security.

Active Publication Date: 2020-07-31
北京数科网维技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Third, many files related to personal privacy, business secrets, and even national security are transmitted on the network. If these information are browsed, tampered with or maliciously attacked by illegal elements, there will be extremely serious consequences
In order to solve the problem that the current encryption algorithm has a large number of inherent repetitive patterns in the process of pixel scrambling, pixels can only be exchanged between the same bit levels, and random mapping cannot be formed, resulting in poor security of the algorithm. Li Qi et al. proposed pixel Random Mapping and Improved Gravitational Diffusion Encryption Authentication Algorithm

Method used

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  • Method and device for file encryption
  • Method and device for file encryption
  • Method and device for file encryption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0114] A file encryption method, comprising the steps of:

[0115] (1) Parse the entry file OFD / docx / xlsx.xml to obtain document metadata, document file location and secret key;

[0116] (2) Parse the document file Document.xml to obtain the location of the page file in the document file and other information. Other information includes whether the document contains digital signature Signatures.xml, annotations.xml or indexing information presented on the content;

[0117] (3) Analyze the page file Page_N / Content.xml as needed, and present the document according to its content. Each page file contains multiple fonts and image information documents; the index entry of the corresponding font and image information is in PublicRes.xml or PageRes It is stated in .xml that the content is provided by the binary data in the Res file, and the page file is compressed and packaged;

[0118] (4) Encryption: Encrypt the plaintext forming the compressed file respectively, and encapsulate t...

Embodiment 2

[0124] A file encryption device of the present invention includes an entry file parsing module: parsing the entry file OFD / docx / xlsx.xml to obtain document metadata, document file location and secret key;

[0125] Document file parsing module: parse the document file Document.xml, obtain the page file location and other information in the document file, other information includes whether the document contains digital signature Signatures.xml, annotations.xml or indexing information presented on the content ;

[0126] Page file parsing and encapsulation module: parse the page file Page_N / Content.xml as needed, and present the document according to its content. Each page file contains multiple font and image information documents; the index entry of the corresponding font and image information is in PublicRes. xml or PageRes.xml, the content is provided by the binary data in the Res file, and the page file is compressed and packaged;

[0127] Encryption module: Encrypt the plai...

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Abstract

The invention belongs to the technical field of file encryption algorithms, and particularly relates to a file encryption method and device with higher randomness and higher confidentiality. The method comprises the following steps: analyzing an entrance file OFD / docx / xlsx. Xml to obtain document metadata, a document file position and a secret key; Analyzing the document file Document.xml to obtain the position and other information of the page file in the document file, including whether the document contains the digital signature Signeaus.xml or annotations Annotations. Xml or indexing information presented on the content. According to the invention, the original format and analysis scheme are maintained, and the plaintext content of the document can be normally identified even if the analysis end program is not transformed; A mechanism of linearization or segmented loading of an original format is reserved; The key content of the file is encrypted, and the security can still be maintained when the file is used for network transmission.

Description

technical field [0001] The invention belongs to the technical field of file encryption algorithms, and in particular relates to a file encryption method and device. Background technique [0002] Since mankind entered the age of information technology, convenient access to file information and security guarantees have always existed with both advantages and disadvantages. Various information technology improvements are to strike a balance between these two goals. How to ensure that information is quickly and conveniently released to authorized audiences has always been the focus of information technology research. Information security is not only related to the country's political, economic, military and other fields, but also closely related to people's daily life and work. How to ensure the privacy and authenticity of user information has long been an important topic in dealing with such issues. The authenticated encryption scheme based on modern cryptographic technology c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/60
Inventor 刘丹李海波丛培勇王少康陈亚军
Owner 北京数科网维技术有限责任公司