Wednesday, July 29, 2009

3.2.1 Defenses

Although file poisoning attacks sound pretty dangerous, we will argue they
do not pose a threat to P2P networks [6]. The main problem is that P2P
applications are often set in the background. When a polluted file is downloaded
by a user, it stays available for a while before being inspected and cleansed. After
a period of time, all polluted files are eventually removed and the authentic
files become more available then the corrupted ones. The reason file-poisoning
attacks are still successful today are due to 3 factors:
• clients are unwilling to share (rational attack).
• corrupted files are not removed from users machines fast enough.
• users give up downloading if the download seemingly stalls.
These 3 factors each give advantage in different ways to the most available file,
which probably is the polluted file at the beginning. Simulations show these
factors tend to greatly slow down the removal of polluted files on the network.

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