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Are zk-STARKs a Sigma protocol? Is the communication interactive? And other doubts

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  1. I've heard that STARKS are not a non-interactive protocol, if so:
  • What is (briefly) the mechanism they use to operate?
  • Can they be considered a Sigma protocol?
  • Why SNARKs are not interactive, instead?
  1. Is it correct to state that STARKS are quantum-secure and they don't need a trusted setup because they are defined in the random oracle model, and they use a hash that is collision resistant and this is also the reason why proofs are bigger and slower to verify, while SNARKS are based on a public/private key system generated on elliptic curves so discrete-log secure, and that's why they are not quantum-resistant, but the proofs are smaller and faster to verify?
  2. Lastly, is STARK actually just an implementation of a zk-SNARK and not a protocol (https://crypto.stackexchange.com/a/74383/96446) because SNARKs can also be constructed without a trusted setup, hence a STARK is just a SNARK with a different cryptographic assumption?
    Thank you!
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