Method and system for file sharing

Abstract

The invention discloses a file sharing method and a file sharing system. The file sharing method comprises steps that: an upload user terminal sends an upload request to a server; the server utilizes an upload user public key to carry out encryption on a randomized number, a first result is generated according to a first randomized number cryptograph acquired through encryption and algorithm information and is sent to the upload user terminal; the upload user terminal parses the first result and utilizes a server certificate to verify the parsed result, if verification is a success, an internal preset function is called, a first randomized number new cryptograph and a file cryptograph are acquired through the first randomized number cryptograph, a server public key and a file to be uploaded; a second result is generated according to the first randomized number new cryptograph and the file cryptograph and is sent to the server; the server receives and parses the second result, another parsed result is verified, if verification is a success, the first randomized number new cryptograph and the file cryptograph which are in the second parsed result are saved. The file sharing method utilizes the preset function in combination with an SM2 asymmetric algorithm to excellently realize confidentiality and access controllability of the shared file.

Description

Technical field [0001] The invention relates to the field of information security, in particular to a method and system for file sharing. Background technique [0002] With the continuous popularization of the Internet and the continuous development of new technologies, automated office systems have largely banned many functions of traditional offices. Many companies have begun to use network technology and database technology to share and collaborate on various reports, speeches and other documents in their daily work, thus realizing a paperless office. The shared files need to be stored in the server's database first, and the user needs to be authenticated when accessing them, and can be viewed after passing the verification. In the prior art, some of the files stored in the server’s data are stored in plain text, and some are encrypted using a symmetric algorithm to save cipher text. If they are stored in plain text, they will be viewed and downloaded by criminals, causing da...

AI Technical Summary

Problems solved by technology

In the prior art, some files stored in the data of the server are stored in plain text, and some are encrypted with a symmetric algorithm and stored in cipher text. If they are stored in plain text, they will be viewed and downloaded by criminals, resulting in data leakage. When stored in ciphertext form, when multiple people share and view it, the operation process is inconvenient, and the key management is also cumbersome

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