Selecting method and system of privacy code words facing Unicode coded documents
A codeword and privacy technology, applied in the field of information hiding, can solve problems such as scattered distribution, achieve the effects of easy operation, increase the amount of information hiding, and facilitate privacy codewords
Active Publication Date: 2015-06-10
INST OF INFORMATION ENG CHINESE ACAD OF SCI
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[0003] However, the distribution of such "spaces" in the Unicode character set is relatively scattered, and there is still no convenient and feasible selection method to obtain a large number of private codewords for information hiding and encoding purposes.
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[0040] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below through specific embodiments and accompanying drawings.
[0041] The present invention proposes a method for selecting privacy codewords oriented to Unicode encoded documents, through which at most 6144 kinds of privacy codewords can be selected, and the selection method is simple and easy to learn, as shown in Table 1, the specific codeword selection method is realized Proceed as follows:
[0042] (1) Randomly select a value p from 0000 to 1111 1 as y 11 value;
[0043] (2) Randomly select a value p from 0000 to 1111 2 as y 12 value;
[0044] (3) Randomly select a value p from 1101 to 1111 3 as y 21 value;
[0045] (4) If p in (3) 3 =1101, then select a value p from 1000 to 1111 4 as y 22 value;
[0046] (5) If p in (3) 3 =1110, then select a value p from 0000 to 0110 4 as y 22 value;
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The invention relates to a selecting method and system of privacy code words facing Unicode coded documents, and a corresponding information hiding method. Through the adoption of the selecting method, at most 6144 kinds of code words can be selected, and the selecting method is easy to learn and understand. According to the system, aiming at different selection demands of users, N (N is a natural number) privacy code words satisfying the requirements of the users are selected; an acquiring system provides 4 kinds of code-word acquiring methods, which comprise a method for random acquisition of code words, a method for continuous acquisition of random code words, a method for continuous acquisition of appointed code words and a method for screening of the acquired random code words, so that the users can conveniently acquire the needed privacy code words, and the operation is easy. In information hiding, through the selecting method and system disclosed by the invention, needed code words can be selected to form a coding table, so that the information hiding amount can be increased.
Description
technical field [0001] The invention belongs to the field of information hiding, and in particular relates to a character encoding selection method and system for Unicode encoded documents, and a corresponding information hiding method. Background technique [0002] With the rapid development of the network today, information hiding technology has been widely used in many fields. In information hiding technology, due to its special structural composition, text documents must look for characters that are not easy to cause people's visual perception to hide information in the text, which we call invisible characters (or privacy characters). Common privacy characters include spaces, tabs, carriage returns, etc. Spaces are divided into single-byte spaces under ANSI encoding and double-byte spaces under Unicode encoding. In the present invention, the privacy characters mainly aimed at refer to a collection of double-byte spaces. This kind of "double-byte space" exists in a larg...
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IPC IPC(8): G06F17/22
Inventor 吴槟冯凯刘磊赵险峰
Owner INST OF INFORMATION ENG CHINESE ACAD OF SCI