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> Does an attacker only need to control the guard and exit nodes, or the middle relay node(s) as well?

No, only controlling the guard and exit nodes is necessary.

> If the latter, can you configure Tor to use more than one middle relay node, depending on your threat model?

Tor makes dozens of circuits in a typical use. You never stick to a single circuit. In the Tor Browser you have first party stream isolation so you get a different circuit (and hence different middle and exit nodes) for each first party domain that you visit.




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