Method for realizing encrypted transmission of group file in instant communication

Abstract

The invention discloses a method for realizing encrypted transmission of a group file in instant communication. The method for realizing encrypted transmission of a group file in instant communication comprises the following steps: 1) the group member A uses the digital envelope to encrypt the group file to be transmitted and generates the encrypted file; 2) the group member A uploads the encrypted file to the file server and obtains the final storage address of the encrypted file from the file server; 3) the group member A uses the storage address to generate a file downloading notification instant message and sends to other members of the group; and 4) the group member receiving the file downloading notification instant message downloads the encrypted file from the file server according to the storage address in the file downloading notification instant message; and then finds the symmetric key ciphertext according to the user ID, and decrypts the symmetric key ciphertext by means of the own private key to obtain the symmetric key; finally, the group member receiving the file downloading notification instant message decrypts the encrypted file by using the obtained symmetric key to obtain the group file. The invention can greatly improve the efficiency while ensuring the safety.

Description

technical field [0001] The invention belongs to the technical field of network communication security, and relates to a method for realizing encryption and decryption of group files, in particular to a method for realizing encrypted transmission of group files in instant messaging. Background technique [0002] The rapid development and wide application of mobile communication technology has brought great convenience to people's life, but it has also brought many security risks, leading to frequent eavesdropping incidents. Especially with the rapid popularization of instant messaging applications, more and more users begin to use instant messaging applications to handle affairs involving work or personal privacy, such as transferring documents and pictures for work. On the other hand, group applications support communication or distribution of materials between multiple users, which also brings a lot of convenience to life and work. At the same time, the risk of information...

AI Technical Summary

Problems solved by technology

At the same time, the risk of information security leakage is also increasing

[0003] Compared with end-to-end file encryptio

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