Method and system for improving transmission security of file

Abstract

The invention discloses a method and a system for improving the transmission security of a file. The method comprises the following steps of: respectively obtaining a first secret key and a second secret key, which are corresponding to each other, in a secret key server according to a friend identifier in triggering information; encrypting the file by a generated session key to generate a file ciphertext; respectively encrypting the session key by the first secret key to generate a corresponding session ciphertext; forming the friend identifier, the corresponding second secret key, the session ciphertext and the file ciphertext into a file packet; and obtaining and analyzing the file packet, outputting the second secret key which is obtained in an analysis way and is corresponding to a receiver when data which accords with a preset format is analyzed and the receiver is a transmitting friend, receiving a third secret key which is generated by a secret key generator according to the second secret key, deciphering the session ciphertext by the third secret key, and deciphering the file ciphertext by the session ciphertext which is obtained in a deciphering way. Therefore, the operation for transmitting the file to a plurality of users can be simplified, and the transmission security of the file can be further improved.

Description

technical field [0001] The invention relates to the field of information security, in particular to a method and system for improving file transmission security. Background technique [0002] With the wide application of computer technology, in all walks of life, almost all data and information will be entered into computers and stored as files. For remote users, viewing these documents requires remote access or local viewing by sending and storing them. Remote access requires authorization, and if the file is transmitted in plain text and stored locally for viewing, it will be illegally intercepted during the transmission process, revealing privacy. [0003] Network hard disk is an important application on the Internet at present, and data security is a core issue of network hard disk application. When transferring and distributing some important files, the traditional method usually uses some symmetric secret algorithm to encrypt the file, and then inform the file receiv...

AI Technical Summary

Problems solved by technology

When transferring and distributing some important files, the traditional method usually uses some symmetric secret algorithm to encrypt the file, and then inform the file receiver of the password in plain text. This method is relatively simple to operate, but there are many security risks: First, when the password is leaked , we cannot guarantee whether the person viewing the file is a legitimate file recipient; secondly, when decrypting after a period of time, if the initial encryption password is forgotten, the user cannot decrypt the encrypted file; thirdly, when the user needs to When a file is encrypted and distributed to multiple people, if the same password is used to encrypt, the risk will be uncontrollable. If any password is leaked, the file will be stolen, and it is difficult to trace the source of the leak. If different The receiver of the file uses different keys to encrypt separately, which increases the workload virtually, and the password table is difficult to maintain

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