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Method of invisibly embedding and hiding data into soft-copy text documents

A technology for text documents and data, applied in the field of improved methods and systems of practice, which can solve problems such as destroying the format of input text

Inactive Publication Date: 2006-08-30
TREND MICRO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, the main disadvantage of the method of inserting or removing white space in order to encode information in the text is that it changes and destroys the format of the original input text
Therefore, all of these encoding and data hiding methods modify the formatting or visual appearance of the original input text, which may be noticeable when edited

Method used

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  • Method of invisibly embedding and hiding data into soft-copy text documents
  • Method of invisibly embedding and hiding data into soft-copy text documents
  • Method of invisibly embedding and hiding data into soft-copy text documents

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Embodiment Construction

[0022] The principle of the present invention is that, under the premise of not affecting the format and visual appearance of the original text, various invisible parameters can be modified between words or space characters in the text. These parameters correspond to text (or character) attributes, including font type of space characters, text color, italic bold or protected attributes or any combination thereof.

[0023] According to the method of the present invention, a flow chart of the method is shown in FIG. 1 , one or more attributes that are invisible at the space characters of the text document are selected (step 10). A preferred embodiment of the invention consists in selecting a single text "color" attribute. Thus, in a single space of text, as many different alternatives as there are colors in the palette can be encoded invisibly.

[0024] encoded value

[0025] Note that the "color" attribute can be combined with another attribute such as "italic". The...

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Abstract

Method of invisibly embedding and hiding data into a text document by modifying selected invisible attributes of invisible characters on a plurality of inter-word intervals, comprising the steps of selecting (10) at least one attribute that is invisible on the space characters used as inter-word intervals, transforming (14) the document into a canonical form by setting on all inter-word intervals the values of the selected attribute to the same default value, encoding (18) the data to be embedded and hidden into the document as an ordered set of values corresponding to the different values of the selected attribute, selecting (20) a set of inter-word intervals among all inter-word intervals corresponding to a set of space characters and replacing (22) on each space character of this set of space characters, default attribute values by the corresponding encoded data.

Description

technical field [0001] The present invention relates to embedding and concealing data into softcopy text documents, such as invisibly embedding the text document's integrity information into the document itself, and more particularly to improved methods and systems for doing so. Background technique [0002] In today's computer network environment, the number of electronic text documents (such as emails) transmitted on non-secure media (such as the Internet) is increasing day by day, and one of the important problems is authentication. It is not necessarily certain to the recipient of an electronic text document that the text document came from, and that no one can impersonate another. At the same time, it must also be verified that the text document has not been accidentally or maliciously modified during transmission. [0003] Accordingly, some methods have been proposed to perform such identification. A standard solution adapted to electronic text documents is to append...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/32G06F17/21G06F12/14G06F17/22G06F21/64H04L9/32
CPCH04N2201/327H04N1/32101G06F17/218G06F17/2294H04N2201/3233G06F17/22G06F40/163G06F40/12G06F40/117H04N1/387
Inventor 弗尔南多·I.·卡罗尔
Owner TREND MICRO INC
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