What is the motive behind private trackers?
If piracy is moral and ethical and enables us to share knowledge, why do private trackers gatekeep this knowledge? It goes against the principles of piracy. Do they do it just to feel superior about bring in a sekrit club?
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I'm curious, I thought with DHT the hash of the file would suffice?
easy for the malicious to spoof...
What do you mean? Are you talking about the hash being spoofed?
It's fairly trivial to craft a dummy file that has the same hash as any given file, the chance of that happening randomly is infinitesimal, hence the usefulness of hashing, but it has been done in the past as a way to poison torrents.
This is FUD. There is no publicly known pre-image attack against SHA1, the hash used in mainline DHT.
Huh, there has been a detected SHA1 hash collision in 2017. But unless your malicious actor is the NSA it’s unlikely they would be able to crack the hash
https://shattered.io/
Collision, not pre-image attack (the two are different)