1. Katzenbeisser, S., Petitcolas, F.A.P.: Information Hiding: Techniques for steganography and digital watermarking. Artech House, Boston (1999)
2. Lie, W.-N., Chang, L.-C.: Robust and High-Quality Time-Domain Audio Watermarking Based on Low-Frequency Amplitude Modification. IEEE Transaction on Multimedia 8(1), 48–52 (2006)
3. Pholsomboon, S., Vongpradhip, S.: Rotation, Scale, and translation Resilient Digital Watermark Based on Complex Exponential Function. ECTI Transactions on Electric Eng., Electronics and Communication 2(2), 40–47 (2004)
4. Wikipedia /Internet,
http://en.wikipedia.org/wiki/Encryption
,
http://mathworks.com
5. Larbi, S.D., Jaïdane-Saïdane, M.: Audio Watermarking: A Way to Stationnarize Audio Signals. IEEE Transaction on Signal Processing 53(2), 816–822 (2005)