33 CFR § 101.520 - Electronic TWIC inspection.
(a) Card authentication. The TWIC must be authenticated by performing a challenge/response protocol using the Certificate for Card Authentication (CCA) and the associated card authentication private key stored in the TWIC.
(c) Identity verification.
(1) One of the biometric templates stored in the TWIC must be matched to the TWIC-holder's live sample biometric or, by matching to the PACS enrolled reference biometrics linked to the FASC-N of the TWIC; or
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