1. Cyber attack (2016) [Online], http://money.cnn.com/2015/04/14/technology/security/cyber-attack-hacks-security/
2. Tor, [Online], https://www.torproject.org/ . Accessed 26 July 2016
3. A. Kwon, D. Lazar, S. Devadas, B. Ford, Riffle an efficient communication system with strong anonymity, in Proceedings on Privacy Enhancing Technologies, vol. 1, no. 20, 2016
4. G.I. Rathod, D.A. Nikam, Darknet: a class of networks to share anonymous digital content. Int. J. Innov. Res. Comput. Commun. Eng. 3(7), 8 (2015)
5. Top 500 websites, ALEXA [Online], http://www.alexa.com/topsites . Accessed 25 Mar 2016