• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

NATO STANAG 4481 FSK KG-84 DECRYPTED !!!

Joined
Feb 22, 2018
Messages
55
#1
Video demonstration of how using AI (artificial intelligence software) can decrypt the KG-84 encryption and present the actual broadcast message in a NATO STANAG 4481 transmission.

Software download links shown at end of video, but not placed directly in this text for security reasons.

The AI-decoder software, developed by JELAIR, makes use of VirtualAudioCable to feed the source-audio from SDR# into the commandline-decoder, which then exports decrypted audio into FLdigi.

The AI-decoder emulates the KG-84 chip and allows decoding by introducing an encryption-error, which halts the emulated chip's encryption-routine, thus 'fooling' the emulated chip into bypass-mode which leads to it decrypting the message instead (A safety-feature of the chip to make sure messages, potentially vital to a military mission, would not by accident become unreadable)

Surprisingly simple exploit the AI-software makes possible.

The AI-decoder has no GUI but is setup via a simple batch-script that defines the VB-cable setup (which obviously differs from computer to computer, depending on your hardware)

Tech-info is shown at the end of the video.

JELAIR/Company36 20190401

 
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