It is still encryption it&#x27;s like calling a caesar cipher not encryption.<p>It still uses a key and some sort of an encryption algorithm the problem with all of these encryption (or call it scrambling algorithms) is that the persevere the integrity of the video frame so basically you are still getting a video frame which can be broadcast and received as any standard video signal while only the image it self will be &quot;encrypted&#x2F;scrambled&quot;.
Because of this there are several brute force methods that can reconstruct the image without having to even know which algorithm was actually used in the encryption because the elements are always the as the video frame maintains the scan lines and even if you use pixels it&#x27;s not that big of a deal.<p>Live sensory image from drones is still fairly low res usually in the 400-600 scan lines range (interlaced video is still quite often used because then for example you can multiplex 2 sensory images e.g. FLIR&#x2F;SWIR and normal visible elctrooptical sensor into a single channel and switch between them without any delay or without any sync issues).<p>Because every frame is scrambled on it&#x27;s own and is still a valid frame we know 3 things 1) all of the data to reconstruct the image is present within the frame 2) all of the data to reconstruct the image is still in the same basic format as the encrypted frame is still a valid video frame 3) we know exactly how many possible combinations there can be based on the resolution of the image.<p>Combine that knowledge with a basic brute force algorithms without knowing anything about how the encryption actually works you usually tie it with something like Fast Fourier transform to detect edges in the frequency domain (because in our case high frequency = edge) because once you get enough of them you know that you actually have a valid image. This results in a relatively very fast algorithm that can produce images (even if not perfect) from any raw scrambled&#x2F;encrypted video.