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Excel ciphertext document recovery method, computer equipment and storage medium

A technology for computer equipment and document recovery, applied in computer security devices, computing, instruments, etc., can solve problems such as difficulty in cracking, low success rate of passwords in ciphertext documents, and inability to meet actual aging requirements, so as to meet the aging requirements of decryption Effect

Inactive Publication Date: 2021-01-29
NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (1) Complex passwords are difficult to crack successfully
If the password of the target user is long or the password is set using a mixed mode of multiple character types, the password space to try at this time is very large, and it is difficult to successfully crack
[0007] (2) The password recovery time of the ciphertext document is long, which cannot meet the actual aging requirements
The password cracking speed of existing methods is difficult to meet such actual needs
[0008] (3) The success rate of ciphertext document password cracking is not high
Through the test of existing cracking tools, it is found that the success rate of password cracking is not high, and there is no guarantee that the target ciphertext document can be successfully cracked

Method used

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  • Excel ciphertext document recovery method, computer equipment and storage medium
  • Excel ciphertext document recovery method, computer equipment and storage medium
  • Excel ciphertext document recovery method, computer equipment and storage medium

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Embodiment Construction

[0040] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific implementations of the present invention are now described. It should be understood that the specific embodiments described here are only used to explain the present invention, and are not intended to limit the present invention, that is, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

[0041] The present embodiment provides a kind of Excel ciphertext document recovery method, computer equipment and storage medium, wherein, such as figure 1 As shown, the Excel ciphertext document recovery method specifically includes the following three steps:

[0042] Step 1: Build the key rainbow t...

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Abstract

The invention discloses an Excel ciphertext document recovery method, computer equipment and a storage medium. The document recovery method comprises the following steps: constructing a key rainbow table of an Excel document: constructing the rainbow table according to an RC4 encryption algorithm adopted by the Excel document; decoding a decryption key of the Excel ciphertext document: decoding anintermediate key of the Excel document by utilizing a rainbow table attack, and taking the intermediate key as the decryption key; decrypting and restoring the corresponding Excel plaintext document:decrypting and restoring the plaintext document by utilizing the decrypted decryption key and the Excel document ciphertext data storage structure information. According to the method, the rainbow table for cracking the secret key only needs to be constructed once, the generated rainbow table is suitable for secret key decoding of all Excel ciphertext documents, and therefore recovery of the Excel ciphertext documents is realized. The document recovery method is irrelevant to the complexity of the document encryption password, the defect that a complex password cannot be cracked in an existing document cracking method is overcome, and the RC4 encrypted Excel document can be effectively recovered.

Description

technical field [0001] The invention relates to the technical field of document restoration, in particular to an Excel ciphertext document restoration method, computer equipment and a storage medium. Background technique [0002] Excel is a spreadsheet software written by Microsoft for users of Windows and Apple Macintosh operating systems. It has become the most popular data processing software because of its intuitive interface, excellent calculation functions, and complete charting tools. Excel software provides an encryption protection function for the generated spreadsheet documents. Users can set two types of document protection passwords, one is the document opening password, and the other is the document modification password. The user can browse the content of the document only after entering the correct password to open the document, and the password to modify the document is to determine whether the user has the authority to modify the document. After the documen...

Claims

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Application Information

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IPC IPC(8): G06F21/60G06F21/62
CPCG06F21/602G06F21/6218
Inventor 张李军于飞吉庆兵谈程石玉
Owner NO 30 INST OF CHINA ELECTRONIC TECH GRP CORP
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