Classification of access control systems

The access control system can be divided into the following three categories according to the access identification method:

1, password recognition

Password recognition: Identify incoming and outgoing permissions by verifying that the entered password is correct. These products are divided into two categories: one is a common type, and the other is an out-of-order keyboard type (the numbers on the keyboard are not fixed and change automatically from time to time).

normal type:

Advantages: easy to operate, no need to carry cards; low cost.

Disadvantages: At the same time can only accommodate three sets of passwords, easy to leak, poor security; no access records; only one-way control.

Disorder keyboard type (numbers on the keyboard are not fixed and change from time to time):

Advantages: easy to operate, no need to carry the card, the safety factor is slightly higher

Disadvantages: The password is easy to leak, the security is still not high; there is no entry and exit records; only one-way control. high cost.

2, card identification

Card identification: Through the card reader or reader card plus password to identify the access permissions, according to the card type is divided into:

Magnetic card

Advantages: lower cost; one person per card (+ password), safe, can be connected to the computer, there is open the record

Disadvantages: card, equipment wear, short life; cards are easy to copy; not easy to control in two directions. The card information is easily lost due to external magnetic fields, rendering the card useless.

RF card

Advantages: Cards, equipment without contact, convenient and safe to open the door; long life, theoretical data for at least ten years; high security, can be connected to the computer, open the door record; can achieve two-way control. Cards are hard to copy.

Disadvantages: higher cost

3, portrait recognition

Portrait recognition: Identify incoming and outgoing ways by examining the biometrics of personnel. Fingerprint type, iris type, face recognition type.

Advantages: Excellent security from the point of view of identification; no need to carry a card

Disadvantages: The cost is high. The recognition rate is not high, the environmental requirements are high, and the user is highly demanded (for example, the fingerprint cannot be scratched, the eye cannot be swollen and bleeding, the face cannot be injured, or the number of beards), and the use is inconvenient (such as iris type and face recognition. Type, installation height position is certain, but the user's height is different)

It is worth noting that most people think that the biometric access control system is very safe. In fact, this is a misunderstanding. The security of the access control system is not only the security of the identification method, but also the safety of the control system, the security of the software system, and the security of the communication system. Power system security The entire system is a whole, which is not closed, and the entire system is not secure. For example, some fingerprint access control systems, whose controllers and fingerprint readers are integrated, should be installed outdoors when installed. In this way, the line that controls the lock switch is exposed outdoors, and it is easily opened by people.