Most biometric security systems only store the key in the form of an output of a one-way hash function where the input is the scan data. You cannot recreate the input from that output, nor can it be used as the key.

Most biometric security systems store only the key in the form of an output of a one-way hash function where the input is the scan data. You cannot recreate the input from that output, nor can it be used as the key.