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Private file protection method based on Walsh code

A file and privacy technology, applied in the field of information security, can solve problems such as expensive encryption algorithms, achieve the effects of ensuring confidentiality, saving workload, and improving reusability

Inactive Publication Date: 2014-09-10
成都艾泽瑞云科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Just the storage and backup of private information no longer meets the needs of users, but large-scale encryption algorithms for information are extremely expensive, so for ordinary users, there is an urgent need for a simple and relatively secure privacy protection method

Method used

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  • Private file protection method based on Walsh code
  • Private file protection method based on Walsh code
  • Private file protection method based on Walsh code

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Embodiment Construction

[0024] The specific technology of the present invention relates to several aspects such as utilizing walsh function to generate orthogonal code, inner product operation and the like.

[0025] Generation of Walsh Orthogonal Codes

[0026] Orthogonal codes are orthogonal spreading codes, generated according to the Walsh function set. Walsh function is a kind of bivariate orthogonal function system whose value is between 1 and -1. It has a variety of equivalent definition methods, the most commonly used is the Hadamard numbering method. The Walsh function set is a complete non-sinusoidal orthogonal function set, which is often used as the user's address code.

[0027] The generation process of the orthogonal function is as follows image 3 Shown:

[0028] 2 N The Walsh function of order can be distinguished by the following recursive formula:

[0029] H1=0

[0030] H 2 = 00 ...

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Abstract

The invention discloses a private file protection method based on the Walsh code. According to the method, a file to be protected is divided into N file fragments; orthogonal codes generated by a Walsh function and the file fragments are subjected to operation respectively so as to obtain a new file with a disturbed sequence, as a private file; the private file is stored in a disk. If the private file is stolen, the original file can still be cracked out without knowing the orthogonal codes; accordingly, file confidentiality is ensured. If a user needs to restore the original file, the original file can be restored by re-operating with the orthogonal codes to obtain original sequence codes of the original file; accordingly, security of the file can be ensured without subjecting the file to complex encryption algorithms, the orthogonal codes are available for reuse, multiple files can share a single set of orthogonal codes, scrambling the sequence of the orthogonal codes is required only, reusability of codes is greatly improved, and workload is saved.

Description

technical field [0001] The invention belongs to a method for protecting privacy in the field of information security, in particular to a method for protecting privacy files based on Walsh codes. Background technique [0002] In today's society, the rapid development of information technology not only provides convenience for people, but also brings security threats. Just the storage and backup of private information no longer meets the needs of users, but large-scale encryption algorithms for information are extremely expensive, so for ordinary users, there is an urgent need for a protection that is simple and relatively secure method. Here we propose a privacy file protection method based on orthogonal codes, which is different from traditional encryption algorithms. The orthogonal code is generated according to the walsh function, and a simple inner product operation is performed to achieve the protection of private files. Contents of the invention [0003] The purpose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/10G06F21/60
CPCG06F21/6245G06F2221/2107
Inventor 佘堃陈立培
Owner 成都艾泽瑞云科技有限公司
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