For maximum security Door-access control system is the best. It is a physical security system that is fabricated to enhance the security of the building or house in which it is installed and restrict unauthorized access to that room or building. Door access control system allows access to specific people in the area and also keeps records of those accesses.
Working of the System

Door access control system uses individual-authentication method to restrict access to specific people. To restrict access to a room or building through door access control systems various methods are used. Authentication is done in this system through smart cards. Only the persons, to whom the smart card is allotted, can enter a room. However one should take care of his card as if it is lost it may cause inconvenience to the visitor.

To overcome this shortcomings of the smart card, biometrics system is used. In this system individuals fingerprints are used for individual authentification.

Advantage

Door access control systems are highly advantageous, efficient and cost effective means of providing security. Using this system one can control more than one door in a networked system. Through this system one can easily operate some doors in the network from remote locations.
Application

For limiting door access door access control systems are used widely worldwide. Some of the place where these door access are used

• Residential Buildings
• Airports
• Military office
• Civil Transportation
• Business Organizations