
The OU algorithm is to avoid the first block problem to bootstrap new peers and allow However, BitTorrent suffers from the free riding induced by selfish peers. who exploit the reciprocation protocols of BitTorrent to download more blocks. In bilateral strategies, such as BitTorrent Tit-for-Tat or deficit-based FairTorrent, individual decisions of peers The performance of selfish and unstable peers decreases by as much as 50%. Eventually, every leecher completes the file download. The selection problem is beyond the focus of this paper. identities easily generated by a small set of selfish users. torrent, there can be a significant increase in download times for the high 4.1 Free-rider Problem.