Access Control
 

By means of a fingerprint sensor the actual fingerprint is taken from this image characteristic points are taken and converted into a numerical table also termed as minutiae which will be stored on the individual access card.
To identify a user to the system he presents the card from which the relevant data including the minutiae are read.
Subsequently the user puts the same finger he used for the enrolment on the access station. From this a new minutiae is created and compared with that one read from the card.
The activated access station decides whether the identification was successful or not. In all cases it sends all data to the server from which further actions are released.
The server looks up the information in its database and performs actions like granting or denying access. However, in all cases it logs the event to its database for later analysis. This can be used for various processes starting just with an entry log or even ending up in monthly payment reports or statistical local presence reports.

In principle the following data are gained during an identification process:

1. Who requires access
2. Is the “who” identical with the content of his ID card?
3. Where the individual required access (Activated Station ID)
4. When the individual required access (Time Stamp of System)
5. Was access granted or denied?

Since all data can be stored security investigations going back in history may give evidences for conspicuous behaviour of a particular person.