PDF format based adaptive text watermarking method

An adaptive, text-based technology, applied in image watermarking, image data processing, program/content distribution protection, etc., can solve problems such as immaturity, and achieve the effect of strong anti-attack ability and good concealment

Active Publication Date: 2016-02-03
SHANGHAI PUBLISHING & PRINTING COLLEGE +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in text watermarking, the research on PDF text watermarking is in a relatively immature stage of development, which forms a huge contrast with the important position of PDF documents in the field of text information. Therefore, the research on PDF text digital watermarking technology seems to be extra important

Method used

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  • PDF format based adaptive text watermarking method
  • PDF format based adaptive text watermarking method
  • PDF format based adaptive text watermarking method

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Embodiment Construction

[0042] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0043] Such as figure 1 As shown, the flow chart of the adaptive text watermark embedding algorithm based on PDF format.

[0044] Step A, converting the copyright information M and the key D to be hidden into an 8-bit binary sequence according to the ANSI coding rules.

[0045] Read the digital watermark information M (such as copyright information) and key D that need to be embedded, and convert the effective watermark information to be hidden into a binary sequence M=m 1 m 2 m 3 ...m s , where m i ∈{0,1}, 1≤i≤s, convert the key to a binary sequence D=d 1 d 2 d 3 ... d t , where d i ∈{0,1}, 1≤i≤t.

[0046] Step B. Perform a cyclic modulo operation on the binary sequence corresponding to the watermark information M and the key D to obtain an encrypted binary watermark sequence.

[0047]The binary sequence of the watermark and the ke...

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Abstract

The invention provides a PDF format based adaptive text watermarking method. The method comprises: based on a PDF format, adaptively selecting a character position required to be subjected to word-shifting coding by utilizing a quadratic residue theory, and performing character interval coding on the whole document, so that a watermark embedding position is in a random state, namely, the watermark embedding position is non-regular, the possibility of watermark destruction is reduced, the robustness of an algorithm is improved, and the purpose of copyright protection is achieved. At the same time, key technologies of loop embedding, synchronous coding, Hamming coding, loop encryption and the like are designed in combination with a cryptology principle and an error correction coding theory, so that the robustness and security of the algorithm are further improved.

Description

technical field [0001] The invention belongs to the field of computer information security. It is used for digital copyright protection of text documents in PDF format, data authenticity identification and secure communication of data. Background technique [0002] In recent years, with the rapid development of network communication technology, people can transmit and publish digital works on the network more conveniently and quickly, which also makes the copyright issues of these works particularly important. Digital watermarking technology has great advantages in copyright protection, so more and more people devote themselves to the research of digital watermarking. Nowadays, people's research on watermarking mainly focuses on image watermarking, video watermarking and audio watermarking, while the research on text watermarking, which is widely used, is less and the results are less. Moreover, more and more important documents, military secrets, commercial secrets, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F21/16G06T1/00
CPCG06F21/16G06T1/005G06T2201/0062G06F21/1063
Inventor 陈青卢宇鹏黄鹏波周广州熊蒙柯婷婷王飞
Owner SHANGHAI PUBLISHING & PRINTING COLLEGE
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