[SPIKE] Encryption HTTPS v3

[golmek]

Acceptance criteria:

• Check if http/3 is usable in our case
• Prepare document describing how to implement encryption using scheme used by http/3 (https://docs.google.com/document/d/1dYxop7BqJKVVspPP5NfOndpCTlUvYR78owwoXvKJy4k/edit#heading=h.lfxqc7j21ndq)
• We want to use session key (symmetric) derivation from public/private key pair
• Algorithm must be stateless (independent from packets ordering)
• Assume that there is no communication, before sending first encrypted message (this is true in case of relayed connections, in case of p2p we could exchange some additional meta information)
  • How can we change algorithm or key length in the future without compatibility issues?
• Schedule meeting with team to discuss findings

[TIMEBOX FOR SPIKE]
8MD