How is Anti-passback Used in Access Control System

SHANGHAI - Oct. 8, 2015 - PRLog -- Anti-passback Principles

Tailgating is when one user enters with a valid card read, and several people enter without using their cards. Anti-passback can be implemented to help alleviate this problem, by tracking whether the card is inside the secure area or outside. The anti-passback feature is most commonly used in this situation: where there is both an “in” reader at the entry gate and an “out” reader at the exit gate. The anti-passback feature requires that for every use of a card at the “in” reader, there be a corresponding use at the “out” reader before the card can be used at the “in” reader again. So long as the sequence is “in – out – in –out – in - out”, everything works fine. However, if a user swipes his card at the “in” reader to get in, and then passes his card back to a friend, the card would not work the second time when it was swiped by the friend. The attempt to use the card a second time would create an “in – in” sequence that is a violation of the anti-passback rules, and this is why access would be denied.

Picture Left: (1.) First the cardholder enters into the area and then the system will allow them to (*2.) exit.
Picture Right: If a cardholder has already (1.) entered and then before they exit they try (or someone else with their card tries) to enter again, the will be (3.) denied because there is an anti-passback violation because it is impossible to Enter and area when the system thinks you are already Inside.

Some Typical Situations

A. When someone enters the entry gate following others without his own authentication, he or she cannot get through the exit gate through his own authentication even his authentication is a valid one. It’s the same when someone gets through the entry gatefollowing others without his own authentication, he or she cannot get through the entry gate through his own authentication.
B. When someone gets through the gate, and then he or she “passes back” that card, say through a window or another door, to an unauthorized user, who then uses the same card to access the building, he or she cannot get through. The password authentication is the same.
C. When someone get through the Fingerprint/Card/Password authentication, he or she doesn’t access, then he or she cannot get through the gate even the authentication is a valid one.

Source Anti-passback Access Control in FalconTeco

FalconTeco Fingerprint&RFID Access Control which support anti-passback include FK3028A (http://www.falconteco.com/showpro.asp?id=1142), FK3008 (http://www.falconteco.com/showpro.asp?id=1041), FK3008C (http://www.falconteco.com/showpro.asp?id=1042),FK3018C (http://www.falconteco.com/showpro.asp?id=1043), FK3028 (http://www.falconteco.com/showpro.asp?id=1099). If you have any interest on our anti-passback access control please feel free to contact us by email:sales@falconteco.com for further information. For more information about FalconTeco please visit: www.falconteco.com.