Konferenzbeitrag
Template Protection: On the need to adapt the current Unlinkability Evaluation Protocol
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Datum
2022
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Gesellschaft für Informatik e.V.
Zusammenfassung
Using ISO/IEC Standards an evaluation protocol exists which properties need to be fulfilled
by each template protection scheme. However, in these standards it is not defined how a sensible
and sensitive key selection should be done such that the demanded properties are reached. For
the analysis regarding the ISO/IEC Standards properties only arbitrary, randomly selected keys are
usually used, but it is not considered that in this case the key selection might result in insufficiently
protected biometric images (templates). By the performed experiments using not only randomly selected
keys, but also considering the best of insufficient (improper) keys, it was revealed that the
unlinkability evaluation protocol is influenced by the key selection. Hence, it is recommended to use
both mentioned key types to analyse template protection methods. This means that the protocol has
to be fine-tuned, in so far that for the best of the worst key choice (which then has to be used in the
protocol) unlinkability still needs to be given.