Meet Dhwani: A Secure NFC Alternative Built In India

On this auspicious occasion of the 67th Independence Day of India, we bring you the news of a recent technical development by a team from the Microsoft Research India who have developed a secure peer-to-peer acoustic NFC alternative titled ‘Dhwani’ (English: sound). As the name suggests the system uses sound waves to transfer data. Instead of dedicated hardware Dhwani uses speaker and microphone on phones to exchange data. The results of their experiment have shown that they have been able to achieve data rates of up to 2.4 Kbps which is enough for standard NFC applications. Since it has been made to work as NFC alternative the range is limited to a few centimetres only.


The team consisting of Rajalakshmi Nandakumar, Krishna Kant Chintalapudi, Venkata N. Padmanabhan and Ramarathnam Venkatesan have laid emphasis on secure communication by implementing 'JamSecure' technology to prevent eavesdropping. ‘JamSecure’ uses self-jamming coupled with self-interference cancellation at the receiver. This means that when the data signal is transmitted across the channel a noise signal is also transmitted along with it that can only be removed by the receiver unit. Any eavesdropper trying to intercept the data shall only be able to pick up the muddled signal instead of the original one.

This technology could have a huge impact on the mobile devices sector as it will help enable extensive NFC applications. Since this is only a software implementation, users can just download an app and achieve NFC functionality on their existing phones. Apple users shall be particularly interested in this development as the Cupertino giant has never brought NFC to its devices.

For a detailed look at this research we recommend the #-Link-Snipped-# on Microsoft Research Blog as well as their #-Link-Snipped-#.

Source: #-Link-Snipped-#


  • Sarathkumar Chandrasekaran
    Sarathkumar Chandrasekaran
    Is it reall 2.4 kbps.Is it enough for NFC?
  • Jeffrey Arulraj
    Jeffrey Arulraj
    For a shorter distance and NFC's are least preferred for transferring large files

    Using Sound waves for data transmission is the limiting factor as it does not allow higher data transmission
  • mani auto
    mani auto
    Is it reall 2.4 kbps.Is it enough for NFC?
    yeah you are right.. the transfer speed is low..try to improve it...
  • Jeffrey Arulraj
    Jeffrey Arulraj
    mani auto
    yeah you are right.. the transfer speed is low..try to improve it...
    The maximum speed which NFC's has achieved is from 106 kbit/s to 424 kbit/s ie 12kBps to 54KBps that is more than enough for the reading a RFID tags and RF tags
  • Nayan Goenka
    Nayan Goenka
    The image shows the device is performing E-commerce actions. Payment of some sort. Are you sure this is secure? What if the sound waves are captured by some other device, decrypted and used. Is it secure in that sense? Plus the speed seems a bit low.
  • Satya Swaroop Dash
    Satya Swaroop Dash
    This system shall mainly be concerned with services like online payments and transactions, and not file transfers. So this speed will be sufficient while you try to use your phone to pay for your bus tickets or exchange credit card information while buying from shops. File transfer will be a problem though, but for this we have Bluetooth and we can use NFC to pair the devices.

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