Keycard lock

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A keycard lock is a lock operated by a keycard, a flat, rectangular plastic card. The card typically, but not always, has identical dimensions to that of a credit card, that is ID-1 format. The card stores a physical or digital pattern that the door mechanism accepts before disengaging the lock.

Contents

There are several common types of keycards in use, including the mechanical holecard, barcode, magnetic stripe, Wiegand wire embedded cards, smart card (embedded with a read/write electronic microchip), RFID, and NFC proximity cards.

Keycards are frequently used in hotels as an alternative to mechanical keys.

The first commercial use of key cards was to raise and lower the gate at automated parking lots where users paid a monthly fee. [1]

Overview

Keycard systems operate by physically moving detainers in the locking mechanism with the insertion of the card, by shining LEDs through a pattern of holes in the card and detecting the result, by swiping or inserting a magnetic stripe card, or in the case of RFID or NFC cards, merely being brought into close proximity to a sensor. Keycards may also serve as ID cards, or as part of an NFC system, have the code transmitted to a mobile phone to be placed into a digital wallet system such as Apple Pay or Google Pay, negating the need for a physical keycard.

Many electronic access control locks use a Wiegand interface to connect the card swipe mechanism to the rest of the electronic entry system.

Newer keycard systems use radio-frequency identification (RFID) technology such as the TLJ infinity.[ citation needed ]

Types of card readers

A mechanical keycard, with "bumps" that operate pins inside of the lock (similar to a pin tumbler lock) Keycard2.jpg
A mechanical keycard, with "bumps" that operate pins inside of the lock (similar to a pin tumbler lock)

Mechanical

Mechanical keycard locks employ detainers which must be arranged in pre-selected positions by the key before the bolt will move. This was a mechanical type of lock operated by a plastic key card with a pattern of holes. There were 32 positions for possible hole locations, giving approximately 4.3 billion different keys. The key could easily be changed for each new guest by inserting a new key template in the lock that matched the new key. [2]

In the early 1980s, the key card lock was electrified with LEDs that detected the holes.

A keycard with a magnetic stripe Magnetic stripe card - hotel key card.jpg
A keycard with a magnetic stripe

Wiegand cards

Since the keycode is permanently set into the card at manufacture by the positions of magnetic wires, Wiegand cards cannot be erased by magnetic fields or reprogrammed as magnetic stripe cards can. Many electronic access control locks use a Wiegand interface to connect the card swipe mechanism to the rest of the electronic entry system.

Magnetic stripe

Magnetic stripe (sometimes "strip") based keycard locks function by running the magnetic stripe over a sensor that reads the contents of the stripe. The stripe's contents are compared to those either stored locally in the lock or those of a central system. Some centralized systems operate using hardwired connections to central controllers while others use various frequencies of radio waves to communicate with the central controllers. Some have the feature of a mechanical (traditional key) bypass in case of loss of power.

Passive RFID

RFID cards contain a small chip and induction loop which the transmitter on the keycard reader can access. The main advantages with RFID cards is that they do not need to be removed from the wallet or pass holder - as the keycard reader can usually read them from a few inches away.

Access control

In the case of the hotel room lock, there is no central system; the keycard and the lock function in the same tradition as a standard key and lock. However, if the card readers communicate with a central system, it is the system that unlocks the door, not the card reader alone. [3] This allows for more control over the locks; for example, a specific card may only work on certain days of the week or time of day. Which locks can be opened by a card can be changed at any time. Logs are often kept of which cards unlocked doors at what times.

Privacy

Computerized authentication systems, such as key cards, raise privacy concerns, since they enable computer surveillance of each entry. RFID cards and key fobs are becoming increasingly popular due to their ease of use. Many modern households have installed digital locks that make use of key cards, in combination with biometric fingerprint and keypad PIN options. Offices have also slowly installed digital locks that integrate with key cards and biometric technology. [4]

See also

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<span class="mw-page-title-main">Wiegand effect</span>

The Wiegand effect is a nonlinear magnetic effect, named after its discoverer John R. Wiegand, produced in specially annealed and hardened wire called Wiegand wire.

<span class="mw-page-title-main">Smart lock</span> Electromechanical lock

A smart lock is an electromechanical lock that is designed to perform locking and unlocking operations on a door when it receives a prompt via an electronic keypad, biometric sensor, access card, Bluetooth, or Wi-FI from a registered mobile device. These locks are called smart locks because they use advanced technology and Internet communication to enable easier access for users and enhanced security from intruders. The main components of the smart lock include the physical lock, the key, a secure Bluetooth or Wi-Fi connection, and a management mobile app. Smart locks may also monitor access and send alerts in response to the different events it monitors, as well as other critical events related to the status of the device. Smart locks can be considered part of a smart home.

<span class="mw-page-title-main">VingCard Elsafe</span>

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The term digital card can refer to a physical item, such as a memory card on a camera, or, increasingly since 2017, to the digital content hosted as a virtual card or cloud card, as a digital virtual representation of a physical card. They share a common purpose: Identity Management, Credit card, Debit card or driver license. A non-physical digital card, unlike a Magnetic stripe card can emulate (imitate) any kind of card.

References

  1. "Key Card Inserted In Slot Opens Gate At Automated Parking Lot." Archived 2017-03-01 at the Wayback Machine Popular Science, August 1954, p. 94, mid page.
  2. "US patent 4,149,394: Lock arrangement employing mechanically acting code card and key card". Google Patents. IFI CLAIMS Patent Services. April 17, 1979. Archived from the original on January 29, 2015.
  3. "Dormakaba USA | for every place that matters" (PDF). Archived (PDF) from the original on 2017-06-08. Retrieved 2017-09-28. pg9
  4. Widness, Brett (21 August 2014). "Bringing Keycard Technology To Smartphones". Urban Land Institute. Archived from the original on 2 June 2015. Retrieved 10 June 2015.