"spam" in the sense of extra unwanted "tags"? I can't see how this can't already be done with current DHT implementations. one who can add "tags" could also add "files" spam.
as i understand it torrent sites are only there to help us translate textual, searchable names to file hashes via torrent and magnet files. filtering should be a side effect of peers preferring to share and keep valuable files over spam files, one should also sort by the amount of seeders (and that is IMHO the difference between DHTs to older one-to-many sharing schemes) some restrictions as to how many tags are kept by peers should, as done with files. make sure more "important" tags are preferred over those with less searches. An extended protection could be the death of unused "tags" (or files for that matter), or actively "killing" near to existent tags or tags whose files no longer exist. the single flaw i can see in regard to spam is if an attacker will create many tags for a single file, shadowing other files with its presence. however, with many different tags I think it's safe to assume a big portion of them will never (or rarely) be searched, thus killed quite fast. one could also add a "vouching" mechanism where other (random) peers may cast a vote whether the file is either unknown, malicious or good. that will complicate the network a bit but will allow the "neutral selection" process that either-way occurs in a more rapid way. obviously all of what I've said is vulnerable to the same weakness family all current DHTs are vulnerable to - taking control of a big percentage of the p2p network will allow an adversary to manipulate it to his advantage. hope i understood you correctly, - Nir. On Tue, Jul 17, 2012 at 12:44 AM, James A. Donald <[email protected]>wrote: > On 2012-07-16 7:56 PM, nir izraeli wrote: > >> or "tag" hashes to point to the real hashes of the wanted file (thus >> avoiding giving a single file multiple "valid" different hashes) >> > > That enables search without requiring mutable directory files, but it may > be more difficult to have spam protection. > > The bittorrent solution is to have the directories that map human readable > names to magnet links on regular websites, enabling both search and spam > protection, but this is vulnerable to attack by the state. >
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