1. Lee, Z.Y., Yu, H.C., Kuo, P.J.: An analysis and comparison of different types of electronic payment systems. In: Proceedings of International Conference on Management of Engineering and Technology, (PICMET 2001), Portland, 29 July–2 August (2001)
2. Husain, F.: A survey of digital watermarking techniques for multimedia data. Int. J. Electron. Commun. Eng. 2(1), 37–43 (2012)
3. Mahajan, P., Sachdeva, A.: A study of encryption algorithms AES, DES and RSA for security. Glob. J. Comput. Sci. Technol. Netw. 13(15), 14–22 (2013). Online ISSN 0975-4172, Print ISSN 0975-4350
4. Metkar, S.P., Lichade, M.V.: Digital image improvement by integrating watermarking and encryption technique. In: Proceedings of the IEEE International Conference on Signal Processing, Computing and Control (ISPCC), 26–28 September (2013)
5. Gonge, S.S., Ghatol, A.A.: Combined DWT image watermarking and AES technique for digital 2-D Image. In: 2nd Proceedings of the IEEE International Conference on Recent Advances and Innovations in Engineering (ICRAIE-2016), Jaipur, India, 23–25 December (2016)