From this I understand that the solution sometimes can be to reverse what we are doing.
So if your code it's not working...... It means that you are going on the totally wrong direction.
B4XCipher is not needed. I just use a front camera.
If a person is wearing a shirt printed "STRESSED" in front of a mirror, the reflected word won't show as "DESSERTS" but is what you see on the right image below.
You can try write on a piece of paper and stand in front of a mirror to check.