http://bittorrent.org/beps/bep_0005.html
https://coderwall.com/p/eplzag/minimal-bittorrent-dht-crawler
https://github.com/whtsky/mala
https://www.cl.cam.ac.uk/~lw525/publications/security.pdf
https://www.usenix.org/legacy/event/woot10/tech/full_papers/Wolchok.pdf
https://arxiv.org/pdf/1009.3681.pdf