Would it be possible to design and attach a system to a smartphone whereby a public key cryptography system is attached a unique private key to a fingerprint without storing anything (the same fingerprint always generates the same private key)?
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1Does this answer your question? Generating deterministic X.509 certificates?, Deriving digital signature key pair deterministically from an arbitrary secret. Also, cryptography questions are better asked at [cryptography.se]. – Steffen Ullrich Mar 17 '24 at 07:27