Key verification

QR-code key verification is currently not reachable because it is not understandable. We need a more detailed concept about key verification.

• Onboarding about keys, reasons and limitations to verify keys for novice users.
• How to display verified keys, s.t. users can distinguish between verified and not verified keys.
• Integrate QR-code verification
• Add alternative type of verification to support manual comparison without qr-code

For an alternative approach we have to check that users verified the keys and it still has to be usable (efficient). There are some research ideas.