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http://www.anu.edu.au/people/Roger.Clarke/DV/BioArch.html
". . .The category addressed here is authentication against a block-list. An example of such an application would be at a border-checkpoint, where the intention is to screen travellers against a database that contains biometric reference-measures for persons who are not to be permitted to cross the border. This could include such categories as convicted drug-runners, people who have previously over-stayed or otherwise breached their visas, and terrorists.
The architecture is as follows:
A process to apply that architecture could proceed as follows:
a.. a sensor gathers a test-measure;
b.. the sensor provides the test-measure to a Secure Processing Module (SPM);
c.. the SPM enters into a two-way authentication process with a token carried by the individual (e.g. in a chip-card performing the function of a passport);
d.. the SPM requests from the token the biometric reference-measure, which has been previously stored in it;
e.. the token provides the biometric reference-measure;
f.. the SPM computes the result. If the test-measure and reference-measure are not sufficiently similar, then exception-handling procedures need to be called into play. The remainder of this outline process description deals with the mainstream case of an affirmation that the person presenting themselves is the person to whom the token was issued;
g.. the SPM requests from the token relevant data about the individual, which has been previously stored in it (e.g. passport-number, date of issue, and name);
h.. the token provides the relevant data;
i.. the SPM checks the relevant data against the block-list;
j.. the SPM provides to the application only the authentication results:
a.. 'The person does/does not match the token'; and
b.. 'The person's identifier is /is not blocked'. . . ."
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