] Exploiting that information would be trivial. Only a bit
] of statistical data, of the sort that any government
] agency in the world could easily afford to obtain, will
] be needed.
]
] Here's what we need to know: how many chunks of a
] splitfile will appear on a node that only relays file
] requests after x amount of uptime. That's it. We already
] know that for nodes requesting a splitfile, the answer is
] 100% of the chunks in the amount of uptime needed to
] fetch them. By running several nodes and observing them,
] we can easily determine how long it will take to cache,
] by relaying alone, an entire file of x size.
]
] Since Freenet logs uptime, a forensic examiner can easily
] learn how long your node has been alive, even if there
] have been interruptions. So it is quite possible to
] estimate how many intact files, and of what size, your
] node ought to have cached without your participation. If
] the examiner finds many more files, or many larger files,
] than predicted, and they are illegal, you are in trouble.
]
] Using a tool called FUQID, which queues Freenet file
] requests, one could easily run a list of forbidden CHKs
] against a disk image. If the number/size of whole files
] containing naughty stuff is significantly higher than
] predicted by your node's uptime, you are in trouble.

Attack against Freenet