nfc seminar

8/3/2019 Nfc Seminar

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NEAR FIELD

COMMUNICATION

PRESENTED BY:

Himanshu Gupta

Pankaj KumarB.Tech Final Year(ECE)


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OUTLINE

Introduction

How NFC Works

Data Transfer Modes

Data Range & Data Rate

Chip Components

NFC v/s Infrared and Bluetooth

NFC Applications Security and Threats

Near Term Barriers

Conclusion


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INTRODUCTION

A short-range wireless technology that enables simple and

safe two-way communication between electronic devices .Consumers can perform contactless transactions, access

digital content and connect devices with a single touch orjust by bringing the two devices in close range of each

otherOperates at 13.56 MHzwithin a range of20 cms.

Compatible with RFID technology.


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Complementary to existing Bluetooth and 802.11 withtheir long distance capabilities.

It does not require line of sight communication. Not restricted to 1-to-1 communication

Multiple devices in a small area can communicate witheach other using the same frequency


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Benefits & Features Reach & Availability

Variety of Applications

Ease of use Security

Value Added Services

Infrastructure Compatibility


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NFC Protocol parameters The NFC communication is based on an inductive RF

link on 13.56 MHzActive and passive NFC mode at different transfer

speeds from 106 to 424 kbps

Backward compatibility with RFID systems

Allows communication between Two powered devices

Powered and non self-powered devices


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Basic Operations Device detection

Initialization of communication

Transmission


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How NFC Works :

It uses magnetic field induction to enablecommunication between two devices.

The host device generates a low-frequency radio-wavefield and waits for another NFC device to get closeenough to contact the field.

Magnetic inductive coupling transfers energy and

data from one device to the other. NFC devices operate in two modes.

a) Passive Communication Mode

b) Active Communication Mode


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Data Transfer Modes

1. Passive Communication Mode

A device with no internal power supply, such as asmart card, is considered passive.


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Multiple devices can be connected in passive mode.

Passive device is always a NFC target.


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Data Transfer Modes

2. Active Communication Mode

Both Initiator and Target device communicate byalternately generating their own field.


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" Listen before Talk" Initiator makes sure no NFC communication is

disturbed.

It detects its vicinity for RF field.


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Data Range & Data Rate

Short distance Inductive Coupling limits NFCs

operating range to20 cm

Supported data rates:106, 212, 424 or 848Kbits


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Chip ComponentsAnalog circuit to process signals coming from or going to anotherdevice

The contactlessUART handles thetechnology behind thecommunication

FIFO buffer allowsdata transfer between

the host and contactlessUART


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NFC v/s Infrared Infrared requires direct line of sight communication

maximum data transfer rate of NFC (848 Kbps) is

faster than Infrared (115 Kbps) NFC has a larger range than Infrared


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NFC v/s Bluetooth

NFC offers shorter set-up time

Connection between two NFC devices is established at. once

NFC BluetoothNetwork Type Point-to-point Point-to-multipointRange < 0.2 m 10 mFrequency 13.56 MHz 2.4-2.5 GHzBit rate 424 Kbit/s 2.1 Mbit/sSet-up time < 0.1 s 6 sCompatible with RFID Yes No


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NFC v/s Bluetooth

NFC uses less power than Bluetooth NFC works when one of the devices is not powered maximum data transfer rate of NFC (848 Kbit/s) is slower

.than Bluetooth (2.1 Mbit/s)

NFC has a shorter range(20 cms.), which provides a degree.of security


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NFC Applications

NFC

payment

Peer-To-Peer

mode

Low Cost Advertising(e.g. smart poster)


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NFCApplications

Mobilecommerce

Documentidentification

Bluetoothpairing

Electronicmoney


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Ticketing & Payment Rely on Radio Frequency Identification (RFID) smart

cards to provide access to transportation syatem.

Ease of use and speed of access

Value Addition by NFC

System Access

Online Recharge

Traffic and Mapping Information Virtual Wallet


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Sharing Simple and seamless transfer of data by touching the

devices together

Whole process of Bluetooth transfer on both sides canbe replaced by a single touch of the two devices

Wireless technology hotspots.

Access and transfer digital media content


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Identity Management Everyday, the no. of workers in companies and

factories are increasing, so is premise access problem.

NFC enabled mobile devices can be used for access tocertain premises and restrict some premises.


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Security Mobile phone pass code and PIN number can be used

to safeguard NFC transactions.

Multiple levels of security can also be incorporated.

A financial limit can be set beyond whichauthorization is required.

High level of security provided by a Secure Element.


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Threats Tag removal

Eavesdropping

Data Destruction Data Modification

Data Insertion


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Near Term BarriersMobile

companies notyet supporting it

Vulnerable todata

modifications

no protection

againsteavesdropping

Data destruction

using RFIDjammer


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Conclusion NFC could help users work with other wireless

protocols

PCs, TVs, and other devices besides cell phones andPDAs may become NFC enabled

Vendors using trial results to determine how best todesign devices and user interfaces to work with NFC

Adoption to be driven by mobile commerce


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Thank You


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References Morris Dworkin, "Recommendation for Block Cipher Modes of

Operation",NIST Special Publication 800-38A, 2001.

W. Diffie and M.E. Hellman, "New directions in cryptography",

IEEE Transactions on Information Theory 22 (1976), 644-654. Press release regarding the NFC standardization

http://www.ecma-international.org/news/Ecma-340-NFCIP-1.htm

Ecma International: http://www.ecma-international.org

C. Ogrey, Sipla, J.Sosa, Betancourt, Estevez , Suitability of NFCfor Medical Device Communication and Power Delivery, Univ.of Texas at El Paso, El Paso.


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