From what I see in the freenet.pdf document at 5.3.1 a computer sends a message containing the TTL (time to live), who sent the message and the recipient.
But the default TTL is usualy 15 (from what I see in the configuration file) so, if a computer receives many requests from another computer with the TTL15 is very likely that the request is initiated by that computer.
So if someone is monitoring the network, for example a member of the communist party from china, could find a list os suspect ip's and then hack those ip's and search inside them if they have a particular information (someone who looks for an informations on freenet is likely to save it inside his computer outside the freenet cache (in the browser cahe for example)) then is trouble for that person...
I don't know if this is possible or if it is possible maybe it was fixed since 1999 but if this scenary is possible then I sugest a very simple solution: at instalation the instalation program writes inside the config file a random default TTL number from 12 to 18 for example.

Catalin
PS: I would like more detailed information about the structure of the today freenet (0.5 or even 0.4 or 0.3). I know that I can read the sources but I prefer an easier way(some documentation or something newer than the 1999 pdf file) :)


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