Software Watermarking Algorithm by Coefficients of Equation

Aiming at speed of the program and capacity of hidden information in traditional algorithms as equation reordering, a new algorithm based on inverse number of equation’s operand coefficient was proposed in this paper. Through the one-to-one relationship between the inverse number and the binary number we can get the Dictionary Mapping. According to the Dictionary Mapping, which is made up of the inverse number of permutation and the binary number, we hide the watermark data. The main advantages of this method are that no code is added to the program and speed of the program is not changed, but the efficiency of hidden data is effectively improved. The capability of this new software watermarking algorithm is better than those of algorithms as equation reordering.