DefinePK

Abstract

A robust text watermarking algorithm is proposed to solve
the problem of copyright protection for Chinese text documents in this study
which watermarking structure and embedding strategy are comprehensively considered.
Structure types and strokes of Chinese characters can be obtained through Chinese
characters mathematic expression and the whole document is divided into two
blocks by utilizing structure types of Chinese characters, the position selected
to embed is chose by Chinese character146s
strokes and the watermarking bit in each block. Watermarking bits with a robust
structure is generated by chaos encrypting and hamming checkout coding. Positions
of the destroyed watermarking bits can be judged exactly and block-checkout
and hamming-checkout are used to recover them. The experimental result indicates
that the proposed algorithm is robust and transparent.