Old school inversion de-scrambling device
- Thread starter SABER3
- Start date
If you live in the U.S., it is possibly illegal to decrypt inverted speech scrambling on radio communications. That said, try these...
deinvert: A Voice Inversion Descrambler
Voice inversion scrambling is a simple and old security method used on analog radios to try and obscure conversations from being listened in on by people with scanners. It works simply by by moving the low frequencies higher and the high frequencies lower, or in other words inverting the audio...
www.rtl-sdr.com
GitHub - windytan/deinvert: Descrambler for legacy voice inversion scrambling.
Descrambler for legacy voice inversion scrambling. - windytan/deinvert
github.com
Descrambling split-band voice inversion with deinvert
A blog about signals, programming, music, and other stuff.
There used to be kits from Ramsey Electronics (?) and ready-built devices that you could buy to de-scramble voice inversion, but I believe they became illegal to manufacture and sell after the ECPA was passed into law. Check on Ebay - you might find one of those old de-scrambler kits or devices from back in the day.
Wasn't Digital Voice Protection (DVP) and early form of encryption?
Wasn't Digital Voice Protection (DVP) and early form of encryption?
IC-R20
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Also nobody cares either so descramble away 🍳
IC-R20
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Get a Cheap Chinese Radio with a scrambler setting and just turn it on.
I got a Baofeng BF888s in 2014 and was lucky enough to get one with the working scrambler setting. When one of the local taxi companies on UHF Conventional started using scrambling I programmed their frequency into multiple channels with each of the different scrambling patterns and just flipped through them until I found which one worked.
Also you can buy AOR communications receivers from Asia or Canada on eBay that will have a descrambler unit, like the DV10 for example. I got a Alinco DJ-X30e (Europe version) on eBay in 2023 that also has a descrambler and is nice and compact.
But, since most radios will use a common set of standardized scramble patterns its not like an encryption key on p25 so the cheapest easiest way is the buy a cheap commercial radio with scrambler and turning it on, odds are most times you’ll be able to hear whatever they’re doing as long as it covers the same RF frequency.
I got a Baofeng BF888s in 2014 and was lucky enough to get one with the working scrambler setting. When one of the local taxi companies on UHF Conventional started using scrambling I programmed their frequency into multiple channels with each of the different scrambling patterns and just flipped through them until I found which one worked.
Also you can buy AOR communications receivers from Asia or Canada on eBay that will have a descrambler unit, like the DV10 for example. I got a Alinco DJ-X30e (Europe version) on eBay in 2023 that also has a descrambler and is nice and compact.
But, since most radios will use a common set of standardized scramble patterns its not like an encryption key on p25 so the cheapest easiest way is the buy a cheap commercial radio with scrambler and turning it on, odds are most times you’ll be able to hear whatever they’re doing as long as it covers the same RF frequency.
That has been a debate for years, with people having different opinions, which is why I said "possibly".
wtp
Member
better off safe than in jail...
gotta ask yourself one question, is it worth it ?
gotta ask yourself one question, is it worth it ?
prcguy
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mmckenna
I ♥ Ø
If anyone thinks voice inversion scrambling is secure, then they deserve it. You can buy nearly any Kenwood radio and it has the inversion frequencies already loaded, just program a channel with each one of the 16(!) codes and try them until you decode it properly.
If your security relies on a 1 in 16 chance of someone guessing the code, then you have zero security.
If your security relies on a 1 in 16 chance of someone guessing the code, then you have zero security.
Here ya go. Coded it myself with the help of AI. Do let me know if it works for you. I have a couple scripts here and I'm not sure if this is the right one. The other was a BFO. I have used this with what I think is a towing company. LOL
Now the nerdy part to those that know. Since this script is nothing but HTML, CSS and JavaScript it can be compiled into Electron (not recommended) or Tauri or Flutter. Which means the code can be compiled to a phone App.
I'll call it unlicense. Unlicense Yourself: Set Your Code Free
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Google AI says 1996 instead of the ECPA date --as usual AI is wrong. If you slightly reword the question, it will tell you that it is not illegal--again AI is wrong. Hard to get AI to give you a right answer to almost anything. Now the easy way is to download the software for a PC that will de-scramble the audio.
Here is a related interesting old document. https://www.govinfo.gov/content/pkg...VPUB-C13-38e6dc21a1cc9e76d55d0dd8391a8559.pdf
Thanks for posting that doc. I scroll right past Google AI results. It's worthless and they are trying to force it on to people.
I thought that it was considered Donald Duck voice impersonation...
IC-R20
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There’s a snippet I put into uBlock plug-in to remove it. Funnily enough after I did that it doesn’t show on my iPad either now. I also added another to block Amazon’s.
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Properly tuned with good software, it is not too bad but is seldom in use today.
rf_patriot200
Active Member
One Campground association in my area uses it on a full moon for their security, but the only agency I know of in 50 miles.
