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A summary of near-field communication

Near-field communication (NFC) is a set of "communication protocols that enable two electronic devices, one of which is usually a portable device such as a "smartphone, to establish "communication by bringing them within 4 cm (1.6 in) of each other.[1]

NFC devices are used in contactless payment systems, similar to those used in credit cards and "electronic ticket smartcards and allow "mobile payment to replace/supplement these systems. This is sometimes referred to as NFC/CTLS (Contactless) or CTLS NFC. NFC is used for "social networking, for sharing contacts, photos, videos or files.[2] NFC-enabled devices can act as electronic "identity documents and "keycards.[3] NFC offers a low-speed connection with simple setup that can be used to "bootstrap more capable wireless connections.[3]



Similar ideas in advertising and industrial applications were not generally successful commercially, outpaced by technologies such as "barcodes and "UHF "RFID tags. NFC protocols established a generally supported standard. When one of the connected devices has "Internet connectivity, the other can exchange data with online services.

NFC-enabled portable devices can be provided with "application software, for example to read electronic tags or make payments when connected to an NFC-compliant apparatus. Earlier close-range communication used technology that was proprietary to the manufacturer, for applications such as stock ticket, access control and payment readers.

Like other ""proximity card" technologies, NFC employs "electromagnetic induction between two "loop antennas when NFC-enabled devices—for example a smartphone and a printer—exchange information, operating within the globally available unlicensed "radio frequency "ISM band of 13.56 MHz on "ISO/IEC 18000-3 air interface at rates ranging from 106 to 424 kbit/s.

Each full NFC device can work in three modes:

NFC tags are passive data stores which can be read, and under some circumstances written to, by an NFC device. They typically contain data (as of 2015 between 96 and 8,192 bytes) and are read-only in normal use, but may be rewritable. Applications include secure personal data storage (e.g. "debit or "credit card information, "loyalty program data, "personal identification numbers (PINs), contacts). NFC tags can be custom-encoded by their manufacturers or use the industry specifications.

The standards were provided by the NFC Forum.[4] The forum was responsible for promoting the technology and setting standards and certifies device compliance. Secure communications are available by applying encryption algorithms as is done for credit cards[5] and if they fit the criteria for being considered a "personal area network.["citation needed]

NFC standards cover communications protocols and data exchange formats and are based on existing "radio-frequency identification (RFID) standards including "ISO/IEC 14443 and "FeliCa.[6] The standards include ISO/IEC 18092[7] and those defined by the NFC Forum. In addition to the NFC Forum, the "GSMA group defined a platform for the deployment of GSMA NFC Standards[8] within mobile handsets. GSMA's efforts include Trusted Services Manager,[9] "Single Wire Protocol, testing/certification and secure element.[10]

A patent licensing program for NFC is under deployment by France Brevets, a patent fund created in 2011. This program was under development by Via Licensing Corporation, an independent subsidiary of "Dolby Laboratories, and was terminated in May 2012.["citation needed] A platform-independent "free and open source NFC library, libnfc, is available under the "GNU Lesser General Public License.[11][12]

Present and anticipated applications include contactless transactions, data exchange and simplified setup of more complex communications such as "Wi-Fi.[13]


NFC is rooted in "radio-frequency identification technology (known as RFID) which allows compatible hardware to both supply power to and communicate with an otherwise unpowered and passive electronic tag using radio waves. This is used for identification, authentication and tracking.


NFC is a set of short-range wireless technologies, typically requiring a separation of 10 cm or less. NFC operates at 13.56 "MHz on "ISO/IEC 18000-3 air interface and at rates ranging from 106 kbit/s to 424 kbit/s. NFC always involves an initiator and a target; the initiator actively generates an "RF field that can power a passive target. This enables NFC targets to take very simple form factors such as unpowered tags, stickers, key fobs, or cards. NFC peer-to-peer communication is possible, provided both devices are powered.[34]

NFC tags contain data and are typically read-only, but may be writeable. They can be custom-encoded by their manufacturers or use NFC Forum specifications. The tags can securely store personal data such as debit and credit card information, loyalty program data, PINs and networking contacts, among other information. The NFC Forum defines four types of tags that provide different communication speeds and capabilities in terms of configurability, memory, security, "data retention and write endurance. Tags currently offer between 96 and 4,096 bytes of memory.

As with "proximity card technology, near-field communication uses "electromagnetic induction between two "loop antennas located within each other's "near field, effectively forming an air-core "transformer. It operates within the globally available and unlicensed "radio frequency "ISM band of 13.56 MHz. Most of the RF energy is concentrated in the allowed ±7 kHz bandwidth range, but the "spectral mask for the "main lobe is as wide as 1.8 MHz.[35]

Theoretical working distance with compact standard antennas: up to 20 cm (practical working distance of about 10 cm).

Supported data rates: 106, 212 or 424 "kbit/s (the bit rate 848 kbit/s is not compliant with the standard ISO/IEC 18092)

The two modes are:

Speed Active device Passive device
424 kbit/s Man, 10% "ASK Man, 10% ASK
212 kbit/s Man, 10% ASK Man, 10% ASK
106 kbit/s Modified Miller, 100% ASK Man, 10% ASK

NFC employs two different "codings to transfer data. If an active device transfers data at 106 kbit/s, a modified "Miller coding with 100% "modulation is used. In all other cases "Manchester coding is used with a modulation ratio of 10%.

NFC devices are full-duplex—they are able to receive and transmit data at the same time. Thus, they can check for potential collisions if the received signal frequency does not match the transmitted signal's frequency.

Although the range of NFC is limited to a few centimeters, plain NFC does not ensure secure communications. In 2006, Ernst Haselsteiner and Klemens Breitfuß described possible attacks and detailed how to leverage NFC's resistance to "man-in-the-middle attacks to establish a specific key.[36] As this technique is not part of the ISO standard, NFC offers no protection against eavesdropping and can be vulnerable to data modifications. Applications may use higher-layer "cryptographic protocols (e.g. "SSL) to establish a secure channel.

The RF signal for the wireless data transfer can be picked up with antennas. The distance from which an attacker is able to eavesdrop the RF signal depends on multiple parameters, but is typically less than 10 meters.[37] Also, eavesdropping is highly affected by the communication mode. A passive device that doesn't generate its own RF field is much harder to eavesdrop on than an active device. An attacker can typically eavesdrop within 10 m and 1 m for active devices and passive devices, respectively.[36]

Because NFC devices usually include "ISO/IEC 14443 protocols, "relay attacks are feasible.[38][39]["page needed] For this attack the adversary forwards the request of the reader to the victim and relays its answer to the reader in real time, pretending to be the owner of the victim's smart card. This is similar to a "man-in-the-middle attack.[40] One libnfc code example demonstrates a relay attack using two stock commercial NFC devices. This attack can be implemented using only two NFC-enabled mobile phones.[41]


NFC Protocol stack overview

NFC standards cover communications protocols and data exchange formats, and are based on existing RFID standards including "ISO/IEC 14443 and "FeliCa.[6] The standards include ISO/IEC 18092[7] and those defined by the NFC Forum.

ISO / IEC[edit]

NFC is standardized in ECMA-340 and ISO/IEC 18092. These standards specify the modulation schemes, coding, transfer speeds and frame format of the RF interface of NFC devices, as well as initialization schemes and conditions required for data collision-control during initialization for both passive and active NFC modes. They also define the "transport protocol, including protocol activation and data-exchange methods. The air interface for NFC is standardized in:

NFC incorporates a variety of existing standards including "ISO/IEC 14443 Type A and Type B, and "FeliCa. NFC-enabled phones work at a basic level with existing readers. In "card emulation mode" an NFC device should transmit, at a minimum, a unique ID number to a reader. In addition, NFC Forum defined a common data format called NFC Data Exchange Format (NDEF) that can store and transport items ranging from any "MIME-typed object to ultra-short RTD-documents,[44] such as "URLs. The NFC Forum added the Simple NDEF Exchange Protocol (SNEP) to the spec that allows sending and receiving messages between two NFC devices.[45]


The "GSM Association (GSMA) is a trade association representing nearly 800 mobile telephony operators and more than 200 product and service companies across 219 countries. Many of its members have led NFC trials and are preparing services for commercial launch.[46]

GSM is involved with several initiatives:


StoLPaN ('Store Logistics and Payment with NFC) is a pan-European consortium supported by the "European Commission's "Information Society Technologies program. StoLPaN will examine the potential for NFC local wireless mobile communication.["citation needed]

NFC Forum[edit]

NFC Forum is a non-profit industry association formed on March 18, 2004, by "NXP Semiconductors, "Sony and "Nokia to advance the use of NFC wireless interaction in consumer electronics, mobile devices and PCs. Standards include the four distinct tag types that provide different communication speeds and capabilities covering flexibility, memory, security, data retention and write endurance. NFC Forum promotes implementation and standardization of NFC technology to ensure interoperability between devices and services. As of June 2013, the NFC Forum had over 190 member companies.[50]

NFC Forum promotes NFC and certifies device compliance[5] and whether it fits in a "personal area network.["citation needed]

Other standardization bodies[edit]

GSMA defined a platform for the deployment of GSMA NFC Standards[8] within mobile handsets. GSMA's efforts include,[51] "Single Wire Protocol, testing and certification and secure element.[10] The GSMA standards surrounding the deployment of NFC protocols (governed by "NFC Forum) on mobile handsets are neither exclusive nor universally accepted. For example, Google's deployment of "Host Card Emulation on "Android KitKat provides for software control of a universal radio. In this HCE Deployment[52] the NFC protocol is leveraged without the GSMA standards.

Other standardization bodies involved in NFC include:


N-Mark Logo for NFC-enabled devices

NFC allows one- and two-way communication between endpoints, suitable for many applications.


NFC devices can be used in contactless payment systems, similar to those used in credit cards and "electronic ticket smartcards and allow mobile payment to replace/supplement these systems.

In "Android 4.4, Google introduced platform support for secure NFC-based transactions through "Host Card Emulation (HCE), for payments, loyalty programs, card access, transit passes and other custom services. HCE allows any Android 4.4 app to emulate an NFC smart card, letting users initiate transactions with their device. Apps can use a new Reader Mode to act as readers for HCE cards and other NFC-based transactions.

On September 9, 2014, "Apple announced support for NFC-powered transactions as part of "Apple Pay.[53] With the introduction of iOS 11, Apple devices allow third-party developers to read data from NFC tags.[54]

Bootstrapping other connections[edit]

NFC offers a low-speed connection with simple setup that can be used to "bootstrap more capable wireless connections.[3] For example, "Android Beam software uses NFC to enable pairing and establish a "Bluetooth connection when doing a file transfer and then disabling Bluetooth on both devices upon completion.[55] Nokia, Samsung, BlackBerry and Sony[56] have used NFC technology to pair Bluetooth headsets, media players and speakers with one tap.["citation needed] The same principle can be applied to the configuration of Wi-Fi networks. "Samsung Galaxy devices have a feature named "S-Beam—an extension of Android Beam that uses NFC (to share "MAC Address and "IP addresses) and then uses "Wi-Fi Direct to share files and documents. The advantage of using Wi-Fi Direct over Bluetooth is that it permits much faster data transfers, running up to 300Mbit/s.[34]

Social networking[edit]

NFC can be used for "social networking, for sharing contacts, photos, videos or files[2] and entering multiplayer "mobile games.[57]

Identity and access tokens[edit]

NFC-enabled devices can act as electronic "identity documents and "keycards.[3] NFC's short range and encryption support make it more suitable than less private RFID systems.

Smartphone automation and NFC tags[edit]

NFC-equipped smartphones can be paired with "NFC Tags or stickers that can be programmed by NFC apps. These programs can allow a change of phone settings, texting, app launching, or command execution.

Such apps do not rely on a company or manufacturer, but can be utilized immediately with an NFC-equipped smartphone and an NFC tag.[58]

The NFC Forum published the "Signature Record Type Definition (RTD) 2.0 in 2015 to add integrity and authenticity for NFC Tags. This specification allows an NFC device to verify tag data and identify the tag author.[59]


NFC was used in "video games starting with "Skylanders: Spyro's Adventure.["citation needed] With it you buy figurines that are customizable and contain personal data with each figure, so no two figures are exactly alike. The "Wii U was the first system to include NFC technology out of the box via the "GamePad. It was later included in the "Nintendo 3DS range (being built into the New Nintendo 3DS/XL and in a separately sold reader which uses "Infrared to communicate to the system). The "Amiibo range of accessories utilizes NFC technology to unlock features.

Bluetooth comparison[edit]

Aspect NFC Bluetooth Bluetooth Low Energy
Tag requires power No Yes Yes
Cost of tag US$0.10 US$5.00 US$5.00
"RFID compatible ISO 18000-3 Active Active
Standardisation body ISO/IEC Bluetooth SIG Bluetooth SIG
Network "standard ISO 13157 etc. IEEE 802.15.1 (no longer maintained) IEEE 802.15.1 (no longer maintained)
Network type Point-to-point WPAN WPAN
Cryptography Not with RFID Available Available
Range < 20 cm ≈100 m (class 1) ≈50 m
Frequency 13.56 MHz 2.4–2.5 GHz 2.4–2.5 GHz
Bit rate 424 kbit/s 2.1 Mbit/s 1 Mbit/s
Set-up time < 0.1 s < 6 s < 0.006 s
Current consumption < 15mA (read) Varies with class < 15 mA (read and transmit)

NFC and Bluetooth are both relatively short-range communication technologies available on "mobile phones. NFC operates at slower speeds than Bluetooth and has a much shorter range, but consumes far less power and doesn't require pairing.[60]

NFC sets up more quickly than standard Bluetooth, but has a lower transfer rate than "Bluetooth low energy. With NFC, instead of performing manual configurations to identify devices, the connection between two NFC devices is automatically established in less than .1 second. The maximum data transfer rate of NFC (424 kbit/s) is slower than that of Bluetooth V2.1 (2.1 Mbit/s).

NFC's maximum working distance of less than 20 cm reduces the likelihood of unwanted interception, making it particularly suitable for crowded areas that complicate correlating a signal with its transmitting physical device (and by extension, its user).["citation needed]

NFC is compatible with existing passive RFID (13.56 MHz ISO/IEC 18000-3) infrastructures. It requires comparatively low power, similar to the Bluetooth V4.0 low-energy protocol. When NFC works with an unpowered device (e.g. on a phone that may be turned off, a contactless smart credit card, a smart poster), however, the NFC power consumption is greater than that of Bluetooth V4.0 Low Energy, since illuminating the passive tag needs extra power.[60]


In 2011, handset vendors released more than 40 NFC-enabled handsets with the "Android mobile operating system. The "iPhone 6 line is the first set of handsets from "Apple to support NFC.[61] "BlackBerry devices support NFC using BlackBerry Tag on devices running BlackBerry OS 7.0 and greater.[62]

"MasterCard added further NFC support for PayPass for the Android and BlackBerry platforms, enabling PayPass users to make payments using their Android or BlackBerry smartphones.[63] A partnership between "Samsung and "Visa added a '"payWave' application on the Galaxy S4 smartphone.[64]

"Microsoft added native NFC functionality in their "mobile OS with "Windows Phone 8, as well as the "Windows 8 operating system. Microsoft provides the "Wallet hub" in Windows Phone 8 for NFC payment, and can integrate multiple NFC payment services within a single application.[65]


As of April 2011, hundreds of NFC trials had been conducted. Some firms moved to full-scale service deployments, spanning one or more countries. Multi-country deployments include "Orange's rollout of NFC technology to banks, retailers, transport, and service providers in multiple European countries,[66] and "Airtel Africa and "Oberthur Technologies deploying to 15 countries throughout Africa.[67]

See also[edit]


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External links[edit]

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