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By Jose Vilches on April 22, 2011
Itís not too far-fetched to imagine a world where all we need to carry around with us is a single do-it-all device. NFC could allow our smartphone to pay for products, open doors, as well as act as our personal ID or a virtual ticket for transport and attractions. Say goodbye to your keys, wallet, cards and any extra weight in your pockets.
Of course, there are loose ends that will need to be worked out before the technology actually catches on, like ensuring the proper infrastructure is there and addressing any security concerns. In this piece we are going to tell you the things that you should know about Near Field Communication and how it could make your life easier in the future.
What Is Near Field Communication?
Let's start with a basic definition: NFC is a wireless technology that makes use of interacting electromagnetic radio fields to transmit small bits of information between an "initiator" and a "target" -- a key card and your hotel room door, for example. It's similar to Bluetooth in the sense that both are short-range communication technologies, and is considered a subset of existing RFID (Radio Frequency ID) standards given that is uses radio waves for identification purposes. But NFC has its unique set of characteristics that will determine how it's used in real-world practical applications.
For one thing NFC transmits data across much smaller distances, typically between 4 and 10 centimeters, compared to Bluetooth's 10-meter range, or in the case of some RFID implementations even kilometers. This by-design limitation reduces the likelihood of unwanted interception and makes NFC particularly suitable for crowded areas where correlating a signal with its transmitting physical device becomes difficult.
Its short-range nature may significantly reduce the risk of eavesdropping but that alone does not guarantee secure communications; applications have to use higher-layer cryptographic protocols like SSL to establish a secure channel.
Another differentiating factor is that NFC sets up connections faster than standard Bluetooth and its low-power variant, Bluetooth 3.0. Instead of performing manual configurations to identify devices, the connection between two NFC devices is automatically established quickly in less than a tenth of a second. In fact, NFC could even be used to speed up the process of pairing two Bluetooth devices, acting as an initiator by simply bringing them close to each other.
Lastly, their data throughput capacity makes them fit for different applications. NFC operates within the globally available and unlicensed radio frequency ISM band of 13.56 MHz and can go up to a maximum data rate of 424Kb/s, whereas Bluetooth operates in the 2.4GHz frequency and can reach maximum data rate of 2.1Mb/s.
How Does It Work?
As mentioned before, NFC involves an initiator and a target, where the initiator actively generates an RF field that can power a passive target without an electricity source. I'll leave the electromagnetism explanations to Wikipedia or your favorite source of nerd facts, but the gist of it is that only one of the devices 'needs' to be powered. This enables NFC targets to take very simple form factors such as tags, stickers, key fobs, or cards that do not require batteries.
A simple example would be holding a NFC-equipped smartphone near a tagged movie poster and getting all relevant information in seconds -- trailer, reviews, schedules at the nearest theater and the option to buy tickets online. The smartphone would be the initiator and the tagged poster would be the passive target.
While the poster can only be a passive target, NFC-equipped devices like smartphones can act as initiators, targets, or both combined in an active peer-to-peer mode. Elaborating on the same example, say you purchased a ticket to that movie from the poster, now you can bypass the line at the box office and redeem the ticket on your handset. The NFC reader at the movies is the initiator and reads the information from your phone, which acts as the target.
I'll discuss other possible uses next but at this point I want to note that some of this is already possible with current technologies like QR codes. You can buy a movie ticket online and get confirmation with a QR code attached by email, which you can print or simply flash from your smartphone screen to be scanned at the theater. So, despite all the hype about disruption, NFC is more about increasing convenience than enabling something completely new. Instead of swiping a credit card or scanning a barcode just tap the NFC reader with your phone and off you go.
What Will We Use It For?
Much noise has been focused on NFC's ability to power mobile payments and that's perhaps because the promise is enticing: It will turn your mobile phone into a wallet. Wave your NFC-equipped phone at a store reader and be on your way. NFC has the potential to replace your credit cards, checkbooks and other clumsy payment methods for a single device that you already carry everywhere. That sounds great if you ask me. So what are other possible uses?
These are just some of the practical applications of the technology. Google implementing NFC support natively within Android is a great boost for developers who want to create applications that rely on exchanging information based on proximity, and with smartphone makers starting to include NFC chips in their products we'll probably see numerous other examples of how we can make our daily interactions quick, effortless and more engaging.
From what I can tell these interactions can be essentially split into three categories: Touch and Go, where a simple tap gives you access to something like tickets for a movie; Touch and Confirm, adding an extra layer of security for things like mobile payments by requiring a PIN code or just accepting the transaction; and Touch and Connect, when there is an active exchange of data such as sharing contact information with another person.
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