Re: Jamming the WiFi channel

Hi Jean,
So the attacks against wireless systems are not only Jamming. Typically wireless attacks can be broadly categorized into 4 types (Jamming, Spoofing, Relaying, and PHY reversing). Yeah, you're right, the military does pay you for building these kinds of systems and this is rather an interesting area to understand. With regards to your question on "Why would want to implement it using SDR?", my answer might not be ideal with my very limited understanding of EW is the flexibility of SDR and it's ability to reconfigure configure, the 555 timers are rigid in terms of providing a jamming signal (okay but I personally like some other waveforms) and there are a bunch of other jamming techniques apart from that 555+VCO like implementations (https://fas.org/irp/doddir/army/fm24-33/fm243_4.htm#:~:text=There%20are%20two%20modes%20of,if%20not%20impossible%20to%20detect.). I had one more reference for your jamming alone which I cannot find but I think it was from Agilent or R&S which had detailed description on different jamming techniques.

But that's not where the fun ends, the fun continues in relaying (actual application is in PEPS system in an automotive system or some cards with that RF chip (though LF...)). But what one can actually do is to combine the PHY reversing and club with multiple attacks and probably fuzz the system. And hence the use of an SDR in these places.

On Sun, Jan 17, 2021 at 11:22 PM jean-michel.friedt@femto-st.fr <jean-michel.friedt@femto-st.fr> wrote:

We might hide or we might discuss ... jamming systems are less than 10 euros on amazon [0]
for any script-kiddie to play with including myself [1]. Why anyone one would want to
implement this in SDR rather than a NE555+VCO is beyond my understanding by why not ...
we even got to reverse engineer such a device to check its performance. The military
will pay you for doing this [2] (and a bit more) so rather than hiding from the real
world we might as well face it and educate users.

My (useless) 2 cents, but thank you for the most informative reference and its introductory
citation
JM

[0] https://www.amazon.fr/IrahdBowen-Bloqueur-Bouclier-Brouilleur-Disjoncteur/dp/B07KSC5LLD
[1] http://jmfriedt.free.fr/misc_deleurrage.pdf [in French] on GPS jamming and jamming cancellation
[2] https://www.defense.gouv.fr/aid/appels-a-projets/appel-a-projets-pour-une-mini-charge-utile-d-appui-electronique-sur-drones [in French]

--
JM Friedt, FEMTO-ST Time & Frequency, 26 rue de l'Epitaphe, 25000 Besancon, France

January 17, 2021 6:24 PM, "Aditya Arun Kumar" <adityaarunkumarphi@gmail.com> wrote:

> Hi Derek,
> Yeah, I accept all the things, after all, I have to, as I tend to wireless systems and their
> security and some more stuff with regards to radios and SDR and things. But what I suggest is that
> we guys start a separate application/discussion area for these kinds of things (because I
> personally as well to some extent historically believe[ https://doi.org/10.1080/03071847709428739
> ]) that this must be an integral part of the ecosystem. I accept the part where one needs to have
> proper RF enclosures or a SCIF to conduct these emission experiments (unless it a wide range of
> open testing).
>
> I propose that we have a separate discussion for things like this, just for educational purposes,
> because I feel that there is too much "Telecommunications" research happening, but very quiet a
> limited discussion regarding "What is the best way to build a signal for a jammer from its spectra"
> or "What happens in spatial resolution compromise in a RADAR system and how this can be a problem".
> Basically, I am trying to say let's break the taboo about the discussion about EW and SIGINT and
> ELINT using SDR and GRC. After all, radios are fun.
>
> This part goes to Mr.Robert
> In my humble opinion sir, I don't agree with you not one bit. Technology is a dual-edged sword, and
> radio is a knife with jagged and pointy edges everywhere. There is no concept of morality (at least
> it cannot be quantified by any metric). EW is an integral part of our life now. And people who are
> into it can and should be able to learn it, no matter what, no matter the cost. This is knowledge
> and as I can say GRC taught me a lot, in terms of learning and sharing their knowledge be it in
> blogs or conferences or this mail list. In fact, this kind of question needs to be encouraged but
> with significant warning labels around them.
>
> On Sun, Jan 17, 2021 at 9:32 PM Robert Heerekop <robertheerekop@gmail.com> wrote:
>
>> To my humble opinion, this is simply not allowed and must therefore from a moral point-a-view not
>> be promoted.
>>
>> Op zo 17 jan. 2021 16:29 schreef Aditya Arun Kumar <adityaarunkumarphi@gmail.com>:
>>
>>> On a serious note, I know that all of us know how to build a jammer, in case of questions like this
>>> how do we deal with it?
>>> I mean I can do both sides, in the spirit of sharing the knowledge I think that someone should tell
>>> the person who is doing it on how to build a jammer (in this case) or should we not help the
>>> person?
>>> Or should we condemn these acts?
>>>
>>> On Sun, Jan 17, 2021 at 10:15 AM Doug McGarrett <dmcgarrett@optonline.net> wrote:
>>>
>>>> On 1/16/21 10:58 PM, paullescot@mailo.com wrote:
>>>>>
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>>>>> Mailo *1 fichier disponible au téléchargement*
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>>>>> * hackrf2.png (35 Ko)
>>>>>
>>>>> Vous pouvez télécharger ce fichier en cliquant sur ce lien ou en le
>>>>> copiant dans la barre d'adresse de votre navigateur
>>>>>
>>>> <https://www.mailo.com/attachlinks.php?id=MTg2NDQuPGVhLW1pbWUtNjAwM2I1Y2ItMTRjNS0yN2Q0OGNlZUB3d3ctMS
>>>> tYWlsby5jb20%2b>
>>>>>
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>>>> https://www.mailo.com/attachlinks.php?id=MTg2NDQuPGVhLW1pbWUtNjAwM2I1Y2ItMTRjNS0yN2Q0OGNlZUB3d3ctMS5
>>>> YWlsby5jb20%2b
>>>>>
>>>>> Ce lien restera valable pendant 30 jours.
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>>>>> Hello, I have build a VCO jammer using gnuradio and I would like to
>>>>> emit the jamming signal on a Wi-Fi channel but nothing is being emitted.
>>>>>
>>>>> Can anyone please help me ?
>>>>>
>>>>> I am newbie to signal processing.
>>>>>
>>>>> PL
>>>>>
>>>>>
>>>> Probably even in France it is illegal to jam radio signals. I sure hope
>>>> that NOBODY helps you!
>>>> --doug
>>>
>>> --
>>> S. Aditya Arun KumarSecurity Researcher, Comms+919123517465
>
> --S. Aditya Arun KumarSecurity Researcher, Comms+919123517465

From:	Aditya Arun Kumar
Subject:	Re: Jamming the WiFi channel
Date:	Sun, 17 Jan 2021 23:45:21 +0530