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1) According to experiments, users associate the term "fingerprint" with crime, not security.

2) Users, even ones who know what fingerprints are and care, do not validate fingerprints. The rest of the users (the other 99.9%) don't either. This is not a good UX.

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I don't know about 1 but definitely agree with you on 2.

You could make validation part of the workflow (before you can even "say yes", you need to scan a QR code for example). You might say this is also not good UX and I wouldn't disagree. Cryptography + good UX is a hard problem.

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