Hidden code inserting and detecting method

Hidden code inserting and detecting method

CN
  • CN 1,933,391 A
  • Filed: 09/16/2005
  • Published: 03/21/2007
  • Est. Priority Date: 09/16/2005
  • Status: Active Application
First Claim
Patent Images

1. one kind embeds the method that hides Info in comprising the document of literal, it is characterized in that, comprising:

  • A) format of a class is out of shape as a passage, select at least one passage to show the hidden code that will be embedded in the document, every class format distortion comprises the distortion of N level, and wherein N is the positive integer more than or equal to 2, different format distortion progression N or identical or different;

    B) determine the coded sequence of hidden code for all kinds of format distortion, the code length after the conversion is M, and wherein M is a positive integer;

    C) select K the word that need carry out the format distortion from the described document that comprises literal, wherein K is positive integer and K 〉

    =M;

    D) according to the coded sequence of determining a selected K word is carried out the format distortion.

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