# Contactless transaction using gnuradio?

**URL:** <https://www.ruby-forum.com/t/contactless-transaction-using-gnuradio/222564>\
**Category:** GNU Radio\
**Created:** [September 1, 2012, 11:41pm UTC](https://www.ruby-forum.com/t/contactless-transaction-using-gnuradio/222564 "2012-09-01T23:41:21Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![aris](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/a/258eb7/32.png) [@aris](https://www.ruby-forum.com/u/aris)\
**Post date:** [September 1, 2012, 11:41pm UTC](https://www.ruby-forum.com/t/contactless-transaction-using-gnuradio/222564/1 "2012-09-01T23:41:21Z")

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hello,  
i am interested in learning if it is possible to use gnuradio to  
implement  
a similar application to how tagpay works, here are some details  
[http://www.tagattitude.fr/en/products/technology](http://www.tagattitude.fr/en/products/technology)

any advise much appreciated.

norman

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**Author:** ![Norman\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/45deac/32.png) [@Norman\_K](https://www.ruby-forum.com/u/Norman_K)\
**Post date:** [September 4, 2012, 4:01pm UTC](https://www.ruby-forum.com/t/contactless-transaction-using-gnuradio/222564/2 "2012-09-04T16:01:17Z")

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On Sat, Sep 1, 2012 at 5:40 PM, Norman K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> hello,  
> i am interested in learning if it is possible to use gnuradio to implement a  
> similar application to how tagpay works, here are some details  
> [http://www.tagattitude.fr/en/products/technology](http://www.tagattitude.fr/en/products/technology)
> 
> any advise much appreciated.
> 
> norman

Norman,

From a signal processing standpoint, sure, GNU Radio should work with  
the basic idea. The issue you face is how to get the information into  
and out of GNU Radio to the external world. You might be able to use  
the audio I/O, but my guess is that you’ll need some more specialized  
equipment. Of course, I say this after a 1 minute look at that  
website, so I’m sure there are subtleties that I’m missing.

Tom

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<div class="post-metadata">

**Author:** ![Norman\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/45deac/32.png) [@Norman\_K](https://www.ruby-forum.com/u/Norman_K)\
**Post date:** [September 4, 2012, 5:18pm UTC](https://www.ruby-forum.com/t/contactless-transaction-using-gnuradio/222564/3 "2012-09-04T17:18:29Z")

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On Tue, Sep 4, 2012 at 10:51 AM, Norman K. [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote:

> hi, i can get the information into and out of GNU radio using tropo  
> [https://www.tropo.com/how-it-works/](https://www.tropo.com/how-it-works/) type application i guess!
> 
> but was interested to see working examples of how to work with the data once  
> it has been received, for example, if i have a python script which creates a  
> dictionary or a key:value object this then generates a unique signal then to  
> be able to process this signal and read the key:value object.

Well, we’re really just interested in getting data in and out of a  
communication application. Once you have the data, it’s a bit outside  
of our box. You might find some useful applications over at [cgran.org](http://cgran.org)  
that use GNU Radio with other data sources/sinks for inspiration.

> is my understanding correct of the process and are there any security issues  
> with this?
> 
> thanks

And yes, I’m sure there are security issues. Aren’t there always 🙂

Tom

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<div class="post-metadata">

**Author:** ![Norman\_K](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/45deac/32.png) [@Norman\_K](https://www.ruby-forum.com/u/Norman_K)\
**Post date:** [September 4, 2012, 4:52pm UTC](https://www.ruby-forum.com/t/contactless-transaction-using-gnuradio/222564/4 "2012-09-04T16:52:45Z")

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hi, i can get the information into and out of GNU radio using tropo  
[https://www.tropo.com/how-it-works/](https://www.tropo.com/how-it-works/) type application i guess!

but was interested to see working examples of how to work with the data  
once it has been received, for example, if i have a python script which  
creates a dictionary or a key:value object this then generates a unique  
signal then to be able to process this signal and read the key:value  
object.

is my understanding correct of the process and are there any security  
issues with this?

thanks