Method for expanding anti-fake digital watermark and electronic seal information content

Abstract

The invention discloses a method for expanding information amount of anti-counterfeiting digital watermark and electronic stamp, which expands the information amount without increasing data amount carried by the digital watermark and the electronic stamp through constructing and using additive safety and application information carried by a subliminal channel, so as to transmit more information to a receiver of protected digital content through the digital watermark or the electronic stamp, and support and realize the expansion of corresponding functions. The expandable functions comprise digital content decryption authorization, additional information for transmitting digital signature or stamp signature, private key or stamp signature loss prevention, enforced digital signature or stamp signature prevention, original digital media content reduction, and the like.

Description

technical field [0001] The invention relates to the technical field of information security, in particular to a method for expanding the information volume of a digital watermark and an electronic seal by using a digital signature subliminal channel. Background technique [0002] The emergence of digital multimedia and electronic files (hereinafter collectively referred to as digital content) has improved the efficiency of people's generation, use and management of information, but it is difficult to confirm the integrity and source authenticity of ordinary digital content, which affects their application in formal occasions . Currently, unauthorized parties can use software processing tools to tamper or forge digital content, often without trace or detection. Therefore, when people adopt digital content in their work, it often needs to be verified. [0003] In the field of information security technology, digital signatures are mainly used to confirm the source and integr...

AI Technical Summary

Problems solved by technology

Chinese patents with application numbers 02139408.3, 02262171.7, 03114673.2 and 03218783.1 [23-26] A digital signature method based on the change of the seal graphic is given. The seal has additional information such as the date of signing and the URL and password of the verification website. However, this verification method is relatively traditional and requires a separate trusted website; the application number is 99123276.3 of Chinese patents [27] A logo management server implementation method based on digital logo authentication is given, but it is quite different from the current general authentication method and is limited in use; Chinese patents with application numbers 200310111928.9, 200510021291.3, and 200610036385.2 [28-30] Fragile or semi-fragile watermarking methods for electronic seal protection are given, but none of them combine public key digital signatures for authentication; Chinese patents with application numbers 200610023373.6, 200710020370.1 and 200610020387.2 [31-33] Proposed a method of combining digital signatures with the current PKI system, the Chinese patent application number is 200610083793.3 [34] It is proposed to use an identification-based public key algorithm CPK for electronic signature, but they mainly describe the application of various public key signatures in digital seals, and no special measures have been taken to expand the concealed information contained in the seal itself Quantity; Chinese patent application number 02125320.X [35] Provides an anti-counterfeiting method that directly inserts digital signatures as barcodes or random numbers into electronic documents or prints them on physical media. The verification of the signature by the server depends on the user's input, so it does not belong to the electronic signature technology based on watermarks. In the application The intuitive effect is not ideal; the Chinese patent application number is 200510027649.3 [36] A method of combining handwritten electronic signatures and seals is given, but watermarking technology is not used in seal generation, but only the digital signatures of documents and handwritten input signatures are calculated and stored in XML documents; Chinese patent application number 01132372.8 [37] An anti-counterfeiting method based on digital watermark is given, the Chinese patent application number is 200310109857.9 [38] An electronic signature technology based on this method is given. However, this method detects watermarks based on correlation operations, which affects the information capacity of watermarks and does not support application characteristics such as reversibility; [44-47] The derived patent only involves the electronic equipment of traditional physical seals, so it has no technical relationship with the present invention

[0012] Based on the above, it can be concluded that, at present, there is no precedent for digital watermark and electronic seal technology to expand the information volume of digital watermark and electronic seal by using subliminal channels of digital signatures. Functionality is wasted and neglected, while expansion of information capacity and related functions is needed in the field

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