What is a Card Reader?
A hardware device that can read from and write to a memory card or memory stick is termed a card reader. Its task is to transfer data to computers and other devices for display or storage.
Technically, it is an electronic sensor that scans a credit card, membership card, or other object's bar code.
Unlike earlier card reading technologies, which required the vendor to create and store physical copies of the information, modern card readers can electronically scan and analyze information at instantaneous speeds.
The variety of drivers and software options required to accomplish the conversion from one format to another is one of the most important considerations when creating card readers. The techniques and approaches used in such conversion vary from product to product, but overall, manufacturers have improved USB card readers and other devices to make them universally workable, so that the majority of recipient devices can accept and read the data from a portable card or stick.
Type of Card Readers
There are variety of card readers. They are:
- Smart Card Readers
- Memory Card Readers
- Access Control Card Readers
- Banking Card Readers
1) Smart Card Readers
Electronic operations such as personal identification, access control, authentication, and financial transactions use smart card readers, a form of plastic technology card with an embedded chip. This kind of data is obtained by smart card readers.
There are several different types of smart card readers, including contact, contactless, and combination devices.
- Contactless Card Readers: Contactless smart card readers communicate with the card as it approaches them using radio frequency technology. There is no requirement that the card be physically put onto or into the reader. The increased convenience and quickness of not having to enter the card into a reader is provided by contactless card readers. The most typical uses for contactless card readers are for toll booth fares, parking, electronic passports, door and facility access, and vending machines.
- Contact Card Readers: Contact smart card readers require that the user manually insert the card into the device. The most widely utilized applications of this technology are those that require greater security, such as government IDs, e-commerce, university IDs, network security, vending, meal plans, loyalty, electronic cash, and health care cards.
External devices that can read a Personal Identification Number (PIN) or other data may also be linked to a keyboard (usually called "card readers with PIN pad"). Using this technology, the user can activate the smart card's integrated circuit and communicate with it via protocols to read and write to a specific address on the card.
2) Memory Card Reader
Flash memory cards can be read by a memory card reader, that can then transfer the information from the card to a computer. There are plenty various types and formats of flash memory cards, which offer removable storage for digital devices like mobile phones, MP3 players, cameras, and camcorders.
Without a memory card reader, a user must connect their physical memory card-using device directly to their computer. Generally, a USB or Firewire cable is used for this purpose.
Some memory card readers are so thin that they hardly occupy any more space than the cards they read. These connect directly to a USB port. There are a variety of options between these two types, some of which are created to be internally installed for free on desktop PCs.
Memory card readers are often very cheap, and you can find them at a lot of local and online suppliers of computers and digital equipment.
The majority of card readers enable for writing, therefore when used with a card they can be used as a pen drive.
3) Access Control Card Reader
Access control card readers are used in physical security systems to scan a credential that permits entry through access control points. Access control readers include proximity readers, smart card readers, magnetic stripe readers, bar code readers, and biometric readers.
The access control reader is one of many important parts that make up an access control system. These can be the components of an access control system that are most obvious, and they must satisfy a set of requirements. In addition to fitting in well, they must have reliable data integrity, be strong and resilient, and be simple to upgrade if new firmware updates or functionalities are required.
According to how they perform, access control card readers are categorized.
- Barcode: A barcode is a series of alternating dark and light stripes that may be read by an optical scanner. The chosen bar code system determines how the lines are organized and how wide they are. There are numerous protocols. The digits indicated by the dark and light bars are frequently additionally printed to allow reading of the number without an optical reader.
The advantage of implementing barcode technology is that it can be quickly applied to cards and other products, and it is inexpensive and simple to create the credential. However, the technology is vulnerable to theft due to the ease and price with which fake barcodes can be produced, for as by photocopying real ones. Printing the barcode with carbon-based ink and sealing it with a dark red overlay is one method of reducing fraud. A reader that is optically tuned to the infrared spectrum can then read the barcode, but a copy machine cannot simply duplicate it. This does not address how simple it is to generate barcode numbers from a computer using virtually any printer.
- Biometric: Fingerprint, hand geometry, iris, voice recognition, and facial recognition are among the biometric identification methods used in access control. The ability of biometric technology to massively increase system security has been promoted. Supporters suggest that the technology solves issues like lost, stolen, or borrowed identification cards and forgotten PINs.
All biometric readers function in the same way by comparing the template stored in memory to the scan obtained during the identification process. If there is a sufficiently high possibility that the template in memory is compatible with the live scan, the control panel receives the ID number of the authorized individual (the scan belongs to the authorized person).
The control panel then determines if access should be permitted by looking up the user's authorization level. Typically, the industry-standard Wiegand interface is used for transmission of data between the reader and the control panel. The smart biometric reader is the only exception; it doesn't need any panels and has direct control over all door hardware.
Limiting the number of users by storing biometric templates in the memory space of readers (there are reader models that have been manufactured with a storage capacity of up to 50,000 templates). User templates may alternatively be retained in the smart card's memory or kept up to date by a central server PC in order to remove any limitations on the number of system users (finger-only identification is not feasible with this technology).
Readers first read the user's biometric information for systems that use a central server, or "server-based verification," before sending it to the main computer for processing. Server-based solutions can support a high number of users but are depending on the central server's durability and connection lines.
There are two basic modes of operation for a biometric reader. They are
- 1-to-1: A user must initially either provide an ID card or enter a PIN in the 1-to-1 mode. The reader then searches the database for the template associated with the relevant person and compares it with the live scan. The reader only needs to do one comparison, making the 1-to-1 technique quicker and thought to be more accurate. The majority of one-to-one biometric readers are "dual-technology" readers, which means they provide inputs for either an internal proximity, smart card, or keypad reader or an external card reader. When a user submits biometric data, like a fingerprint or retina scan, the reader compares the live scan to all of the templates stored in memory.
- 1-to-many: Most end users like this strategy because it does not require them to carry ID cards or utilize PINs. The reader may have to conduct millions of comparison operations before it discovers the match, which makes this method slower. The quantity of comparisons that can be made in a 1-to-many reader in one second, which is regarded as the longest period of time that people can wait at a door before perceiving a delay, is a crucial technical feature. A majority of 1-to-many readers can match 2,000–3,000 items per second today.
- Magnetic Stripe: Magnetic stripe technology, also known as mag-stripe, is provided by the magnetic oxide tape stripe that is laminated on a credit card.
The magnetic stripe contains three data tracks. Normally, the data on each of the tracks corresponds to a particular encoding standard, however any format can be encoded on any track. In comparison to other card technologies, a mag-stripe card is inexpensive and simple to design. In the same amount of space, the magnetic stripe can store more data than a barcode. The technology for reading and encoding data on a mag-stripe is straightforward and extensively utilized, despite the fact that generating one is more difficult than creating a bar code. Misreads, card damage, and data corruption are also risks with magnetic stripe technology. These cards are also exposed to some types of skimming, in which the data read from the card is retrieved by placing unwanted devices over the reader.
- Wiegand Card: The unique Wiegand card technology uses integrated ferromagnetic wires that are arranged in a certain manner to produce the identification number. Like with magnetic stripe or barcode technology, this card must be swiped through a reader in order to be read. The identity device is built in the card and is resistant to wear, unlike the other methods. Because it is challenging to copy, this technology once had fame due to its high perception of security. However, proximity cards are taking the place of this technology due to its limited supply, relative improved tamper resistance, and convenience of touch-free operation in proximity readers.
Proximity card readers are still referred to as "Wiegand output readers" even though they no longer employ the Wiegand effect. The Wiegand source data is preserved by proximity technology, making it possible for new readers to work with existing systems.
- Proximity Card: A contactless card that can be read without being inserted into a card reader is called a proximity card. They can be kept in a wallet or purse without having to be swiped in order to function. Proximity cards have the same appearance as a standard 30 mil PVC card, but they also have a copper antenna coil inserted within that contains the encoded data. Clamshell cards, key fobs, and stickers are examples of other proximity items.
The 26-bit Wiegand proximity format is extensively used. This format makes use of a facility code, also known as a site code frequently. The facility code is a special number shared by every card in a specific set. The plan is for each organization to have their own facility code and a set of cards with numbers starting at 1. A separate facility code is used by another organization, and their card set also starts at 1. Multiple organizations may have card sets with the same card numbers because the facility codes are unique, but the cards will only work at that one organization. This concept was successful in the early stages of technology, but since there is no institution in charge of card numbers, many card makers are free to give cards with the same facility codes and card numbers to various organizations. As a result, there can be duplicate cards that provide access to numerous services in a single location. Some manufacturers have developed formats other than 26-bit Wiegand that they control and provide to organizations in order to address this issue.
Bit 1 is an even parity bit in the Wiegand format, which uses 26 bits. Facility codes are bits 2 through 9. Card number is represented by bits 10–25. The parity bit 26 is an odd one. 1/8/16/1. A leading facility code is followed by the card number in other formats, too, such the 1/12/12/1 format used by some American access control companies, which also includes parity bits for error checking. Additionally, Wiegand was expanded to 34 bits.
4) Banking Card Readers
Several banks have given their clients personal smartcard readers to support various electronic payment applications. Banking cards are used by the Chip Authentication Program (CAP) to verify online transactions.