Scheme self-adaptive digital watermark embedding and extracting method based on camouflage technology

Abstract

The invention provides a scheme self-adaptive digital watermark embedding and extracting method based on the camouflage technology. The method comprises the main steps that multiple sets of subschemes of relevant operations having both the camouflage property and the identity property are built; an index number is set for each set of subschemes, and an initial scheme sequence is obtained by arraying the subschemes in an ascending order; the BKDR Hash value of secret key information is calculated, and is used for carrying out sorting operation on the initial subscheme sequence to obtain a self-adaptive scheme sequence; according to a self-adaptive scheme sequence table, watermark information is embedded in sequence in a circulation mode. The scheme self-adaptive digital watermark embedding and extracting method has the advantages that the tamper localization function is achieved, the purpose of improving the safety of formatted text document watermark robustness is achieved by means of the camouflage technology, and the problem that watermark information is likely to be illegally extracted and then cracked due to the method of embedding watermarks by adjusting formats of formatted text document watermarks is solved.

Description

technical field [0001] The invention belongs to the field of computer information security and is used for digital copyright protection of text documents, data integrity identification and safe covert communication. In particular, it relates to a scheme-adaptive digital watermark embedding method and extraction method based on camouflage science. Background technique [0002] With the development of computer information technology, a large amount of information data needs to be transmitted through the network. Studies have shown that more than 80% of the disseminated information is carried by text, and national security departments, enterprises and institutions will have a large amount of text. Materials, such as some important documents, military secrets, commercial secrets, electronic contracts, etc., are also connected to the Internet in various ways, which can realize the mutual access of corporate users and Internet users and the sharing of certain open resources. Whil...

AI Technical Summary

Problems solved by technology

[0005] The classic line-spacing coding and word-spacing coding algorithms proposed by Brassil et al., as well as various optimizations or innovations of text watermarking algorithms based on format coding based on this, still have the same obvious shortcoming, that is, the algorithm There is a one-to-one mapping relationship between the parameter values ​​set for related operations around various character attributes and the binary watermark information (that is, a fixed parameter value identifies the character "0", and another fixed parameter value identifies the character "1"), The illegal parameter value of the character attribute can be easily obtained by using the application program.

With the rapid improvement of computer processing power, it is becoming easier to crack the extracted binary watermark information, which largely limits the application and development of text watermarking algorithms based on format encoding.

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