What is the difference between image scrambling and image encryption or are they the same thing in the context of image processing? What about in communication systems in general?
Scrambling is used for making a signal more white (I mean flat spectrum). Encryption is used for protecting the data from unauthorized listener. If you just scramble the data it is quite easy for a professional to descramble it and obtain the source image, but if you encrypt it then it is difficult or impossible to reverse it for someone without the code.