On 09/02/16 08:58, Arne Babenhauserheide wrote: > Matthew Toseland writes: > >> Awesome! We need to: >> 1) Implement this. > Yepp. > >> 2) Publish it. > We should… Stefanie and Michael might be able to gain something from > that. Maybe you, too? > >> Why is reinserting the whole datastore important in the case of an attack? > Because in normal swapping, as soon as the network settled a bit, the > changes in location should be small (though my nodestats look different: > too large changes in location for my taste…). So the node data should > still be reachable. When randomizing the position, however, the step is > large and the node might settle into a new part of the keyspace, so the > store might not be reachable anymore.
Not in all cases. E.g. merging several growing darknets? Is this slow enough that we don't care? OTOH: Can this be used as some sort of DoS? Is 2 hops enough? Etc. This was likely discussed way back when darknet was first proposed, maybe Oskar has an opinion about it ... >> AFAICS we are looking for a gap much larger than the node's local >> average peer distance? In practice this is likely to vary a lot because >> of different node degrees etc? > Yes. Node degree is the core variable for that. Thanks to FOAF > information we should be able to use an average degree of all friends > for the calculation. > >> On opennet, performance has a big impact; >> on darknet, a node's location on the graph and its peer count? I'm >> thinking of the problems we had around the time Pitch Black was >> published - at least some of it was due to nodes with few peers taking >> locations in big gaps and then leaving the network. > We can’t keep nodes from leaving, but we can keep swapping which spans > large parts of the keyspace from making parts of the datastore > inaccessible. On a hybrid network we still have the aristocracy problem: Because opennet is meritocratic, fast nodes tend to connect to fast nodes. Hence the distribution is likely to be non-uniform - slow nodes will be out on the edge and have poor connectivity i.e. possibly a different mean distance?? Does this affect this? > > Best wishes, > Arne
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