Scheme of Secret Watermark Based on Extending Frequency Theory
基于扩频原理的秘密水印方案*

This paper proposed a secret watermarking scheme in frequency domain based on extending frequency theory.According to it,a particular and integrated scheme was designed combining with the characteristics of shorter key and higher security intensity for elliptic curve cryptosystem.And also,the frequency domain secret information embedding algorithm and pick-up algorithm were designed in detail.Finally the scheme's strongpoint was analyzed.