I can’t speak for other people or the FOXSAT, but I know when I was looking into providing an offline program for the FOX boxes, your observation is correct. (With thanks to af123 for providing the files). I’m surprised that it hasn’t been done for the FOXSAT. If prpr is suggesting that there is no known way of saving a decrypted file from a FOXSAT then this would be impossible.If there are example encrypted and decrypted versions of the same file available it should be possible to see if they have used the same approach at least. i.e. only encrypt part of each packet.
Having said that, I can obtain encrypted and decrypted files for the 5000T and I’m non the wiser!