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/tech/ - Technology

"Technology reveals the active relation of man to nature"
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File: 1608526064380.png (55.37 KB, 600x318, download.png)

 No.2755

So there's a small ongoing discussion atm about Guerilla comms in the following thread.
>>>/leftypol/611691 (https://bunkerchan.xyz/leftypol/res/611691.html)

So it brings up the question. In a hypothetical SHTF situation in the continental USA, where Guerillas must operate from clandestine forest bases, and move consistently without an abundant power supply or reliable physical networks, also against an adversary with a very large signals department;
How do we secretly send messages that only an intended recipient, ie Guerilla command or other groups can read?

So one poster suggested a mix of HAM radio types, with modification to allow for encryption, and another suggested LoRaWAN gateways like pest control units or trail cameras use, but with gateways acting as tor servers.
What do you guys think?

 No.2756

File: 1608526064493-0.jpg (77.33 KB, 960x720, download (1).jpg)

I think preppers have done a lot of the footwork with this kind of stuff, especially the conspiracy/militia types.
For example: https://www.survivopedia.com/what-a-ham-radio-is-and-how-experienced-preppers-use-it/
http://www.tacticalrepeater.com/radio-encryption/

There's some issues though.
You want to privately make communication from your groups radio guy to the HQ, or to one other group. That's fine, you take their public key being broadcast and encrypt the data so that their private can decrypt, but how do you send a message to everyone at once? Sequentially?

What about signals analysis? Is there no way that they could hone in on the strength of the signal and have a direct route to your guerilla camp?

I'd propose that you should have to use a password to access your own radios as well with full ID verif, and a system similar to TCP packets for data transfers as well.
Can we engineer this?

 No.4872

>>2755
Do we have any new guerilla communication threads up?

>LoRaWAN gateways like pest control units or trail cameras use, but with gateways acting as tor servers.

I'm very interested in this, how the hell would it work?

>>2756
>What about signals analysis? Is there no way that they could hone in on the strength of the signal and have a direct route to your guerilla camp?
I was talking to my friend about this a while back and the idea that he came up with was using pulses from infrared light beams focused on a precise point in order to transmit information. Has anyone heard of anything like this?

 No.4873

>>2755
Ham radio anon here. You could use something like FreeDV with symmetric crypto and a nonce for every frame. FreeDV works even when you can't hear the signal, down to around -10 dB SNR in a 2.5 kHz bandwidth. This is better than SSB.

Codewords can work just as well as encryption, and works over analog radio (FM, SSB).

You can use APRS for simple data communication and station-to-station chat.

Keep in mind even if you use encryption the feds can easily use HFDF to pinpoint your location. Consider using a remote controlled rig.

Using very large bandwidth can also work to avoid HFDF, since that spreads your signal out enough for it to just look like noise. Something like CDMA and UWB combined.

You can get very large coverage per Watt if you use HF bands like 20m (14 MHz) or 40m (7 MHz).

 No.4876

>>2755
>So one poster suggested a mix of HAM radio types, with modification to allow for encryption, and another suggested LoRaWAN gateways like pest control units or trail cameras use, but with gateways acting as tor servers.
What do you guys think?
Ideally you would not only try to harden the software, but also optimize the hardware if you can make antennas more directional it will be harder to detect them because they create lower stray EM emission unless you happen to be in-between two actively communicating devices.

 No.4886

The best way to do it is number stations. E.G A type of code that can only be decrypted once and is tossed.

https://en.wikipedia.org/wiki/Numbers_station

 No.4899

>>4886
Dealing with one-time pads is a major hassle tho


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