A method and system for hiding and extracting key information based on compressed archives

Abstract

The invention discloses a method and system for hiding and extracting key information based on compressed archives. The hiding method includes: step S1, defining a set of lossless compression algorithms R n , a reversible target mapping function L and the inverse mapping function of the target mapping function L, and define a bijective reversible mapping function MR for each compression algorithm i ; Step S2, obtain the key information X that needs to be hidden, a set of lossless compression algorithm Rn and compressed archive A information as the input carrier; Step S3, obtain the node U of the compressed file i , to determine whether it is a compressed file or a directory; step S4, if U i To compress the file, then utilize the reversible target mapping function to decompress it, and store it in the U file, determine which compression algorithm to use to recompress the U file according to the key information and the target mapping function; step S5, if U i is a directory, then search for U again i child nodes, and return to step S3, and recursively process each child node.

Description

technical field [0001] The invention relates to the technical field of key information hiding, in particular to a method and system for hiding and extracting key information based on compressed archives. Background technique [0002] With the explosive growth of data and the popularization of Internet technology, the Internet has become an important way for us to transmit and communicate information. However, while we enjoy the convenience brought by the Internet, the Internet also brings us huge How to ensure information security has aroused great concern in the industry. [0003] The traditional information security protection mechanism is mainly based on cryptography, using complex encryption algorithms to encrypt the transmitted information first. This method can guarantee data security to a certain extent, but due to the rapid development of computer hardware, cracking The time for encrypting files is becoming shorter and shorter. According to reports, DES with a 56-bi...

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Problems solved by technology

[0007] In order to overcome the deficiencies in the above-mentioned prior art, the object of the present invention is to provide a method and system for hiding and extracting key information based on compressed archives, so as to solve the problem of using images, audio and text as carriers in traditional information steganography. It is easy for the attacker to steal the user key through malicious attack means, so there is a problem of information leakage

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