Up-link (card/reader) threats

U1. (S1/S2) Interception of fingerprint template.

U2. (S1/S2) Manipulation of fingerprint template.

U3. (S2/S4) Interception of fingerprint image.

U4. (S2/S4) Manipulation of fingerprint image.

Possible countermeasures: encryption (U1 & U3) and MAC (U2 & U4).

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