A Robust Watermarking Scheme for Online Multimedia Copyright Protection Using New Chaotic Map

Figure 7

Graphical illustration of 4 4 S-Box substitution. The 4 MSBs are divided into two parts, each having two bits. The decimal value of first two bits represents the row number of 4 4 S-Box and the decimal value of last two bits represents the column number of 4 4 S-Box. The value at that position of S-Box will be replaced with those 4 MSBs.