EMBEDDING AND DETECTING HIDDEN INFORMATION

摘要

A novel method is disclosed for embedding hidden information in a document comprising characters, comprising: selecting at least one channel corresponding to a class of layout transformation to represent the hidden codes to be embedded into the document, wherein each class of layout transformation includes N levels, and N is an integer greater than or equal to 2, and the values of N for different classes of layout transformation can be the same or different; for each of the selected channels determining a code sequence of hidden codes for the class of layout transformation to which the channel corresponds, wherein a positive integer M stands for the length of the transformed hidden codes; selecting K characters that will be subjected to the layout transformation from the document comprising characters, wherein K is a positive integer and K ‰¥ M; and performing layout transformation on the selected K characters according to the determined code sequence. The method for embedding and detecting hidden information in electronic documents that mainly include characters is significantly interference-proofing and highly tolerates varieties of interference patterns.