I believe I once read that back in the day, Al-Qaeda decided that AES and the like was probably compromised because it was made by the infidels, and launched their own "Islamic secure messenger" with an encryption algorithm their people had designed themselves.
This is not only terrible from a "let's get the list of all accounts who downloaded this app and perhaps track their phones" perspective, but also the encryption turned out to be exactly as good as you might have guessed.
This is not only terrible from a "let's get the list of all accounts who downloaded this app and perhaps track their phones" perspective, but also the encryption turned out to be exactly as good as you might have guessed.