Leena Couturié

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A barcode is a series of alternating dark and light stripes. The organization and width of the lines are determined by the barcode protocol. There are many different protocols. Sometimes the digits are printed to make it easier for people to read them without a reader.

The advantage of using barcode technology is that it is cheap and easy to use, and can be applied to cards or other items. The technology is susceptible to fraud because it is so easy to create fake barcodes and because they can be created cheaply and easily.

One way to reduce fraud is to cover the barcode with a dark red layer. The barcode can be read with an optical reader, but it cannot be copied with a camera.

This doesn't address the ease with which barcode numbers can be generated from a computer.

There are many different types of identification that are used in access control. The ability of biometrics to increase the level of security of systems has been promoted. Proponents say the technology eliminates problems such as lost, stolen or borrowed ID cards.

The template stored in memory is compared with the Scan obtained during the identification process to see if it matches the template stored in memory. The identification number of the authorized person is sent to the control panel if there is a high chance that the template in memory is compatible with the live Scan. The control panel checks the user's permission level to see if it should be allowed.

The control panel and reader communicate using the industry standard interface. The only exception is the smart biometric reader, which does not require a panel and directly controls door hardware.

There are models of readers that have a storage capacity of up to 50,000 templates, which can be used to limit the number of users. With this technology, user templates can be stored in smart card memory, which will remove all limits to the number of users in the system, or a central server PC can act as template host.

Readers first read the user's data and then send it to the main computer for processing in systems where a central server is employed. The reliability of the central server and the communication lines are important for server-based systems.

There are two possible operating modes for a reader: 1 to 1 and 1 to many.

Magnetic stripe technology is named after the strip of magnetic oxide tape that is laminated onto a card. There are three tracks on the stripe.

The data on each track is usually followed by a specific standard, but any format can be used on any track. A magnetic stripe card is easy to program.

The magnetic stripe has more data than a barcode. Although a magnetic stripe is more difficult to generate than a barcode, it is still possible to get the technology to read and decode it.

Data corruption, read errors, card wear, and magnetic stripe technology are some of the things that are susceptible to it. External devices are placed over the reader to intercept the data read from these cards.

The identification number is generated by a unique pattern of embedded ferromagnetic wires that are strategically positioned. This card must be swiped through a reader in order to be read.

The means of identification are integrated into the card and are not susceptible to wear. This technology is difficult to duplicate, making it a high perception of security. Due to the limited source of supply, proximity cards are being replaced by proximity readers due to the convenience of the technology.

The "Wiegand output readers" are no longer called that. New readers are compatible with legacy systems because of proximity technology.

A reader emits an electric field from 1 to 20 feet. The LC circuit is used to make the cards. The reader's electric field causes a coil on the card to be touched.

The integrated circuit is powered by the coil. The card number is transmitted to the reader by the integrated circuit.

The proximity format is 26 bits. A facility code is sometimes called a site code. The facility code is a unique number for each card.

One organization has a facility code and a set of numbered cards that increment from 1 A different organization has a different facility code. The cards only work in one organization since the facility codes are different. This idea worked early in the technology, but since there is no governing body that controls card numbers, different manufacturers may supply cards with identical facility codes and identical card numbers to different organizations. There may be duplicate cards that allow access to multiple facilities.

Some manufacturers have created formats that they control and send to organizations.

In the format, bit 1 is even.

A facility code is 2 through 9. The card number can be found in bits 10 through 25.

It is an odd parity bit. 1st of January. Other formats have a similar structure of an initial facility code followed by a card number and include parity bits for error checking.