Watermark capacity theory in binary symmetric channel

If the original cover in digital watermarking system is supposed to be formed by {0, 1}, the watermark model will be simplified to binary symmetric channel (BSC). BSC describes the processes of information hiding and attacking. Based on the theory, the mathematics deduction is made. Calculable expressions of capacity and security value are obtained in the cases such as no attack, X-type attack and S-type attack. It's innovative that straightforward relation is found between capacity and security. It should be of guidance to development of watermark theory and technique. Emulation result proves that the theory and practice are accordant.EI0SUPPL. 226-302