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Is there a way for me to merge a bank account number, fingerprint image and IMEI of a phone into a single entity that I could possibly use as a password in the Kerberos KDC to uniquely identity a Principal?

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No. Fingerprint images can be compared with each other, but are not reliably reproducible with all the exactness that is needed for use as a cryptographic key (and passwords are cryptographic keys that just happen to look like characters).

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