For instance, in a torrent
with 100 seeders and just one leecher, it looks suspicious
if the leecher is constantly announcing large amounts of
uploaded data. Alternatively, the sum of all reported download
and upload amounts could be analyzed over different
torrents and time periods, in order to detect and ban dishonest
peers.
The tracker can also be cheated easily: Clients can
announce bogus information and fake peers so that the
tracker’s peer list fills up with dozens of clients which do
not exist. The seeder and leecher counts reported by the
tracker can therefore be misleading as there are usually
not that many real peers downloading a given torrent. Even
worse, peers asking a tracker for other peers can get a lot
of invalid or stale information, which makes torrent starts
slow.
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