I have been thinking about creating a cryptography tutorial for some time. I finally got around to it today. I created a new repository on my Github and I uploaded the first file, addsubtract.py. I ...

- text (str): The input text to encode or decode. - shift (int): The number of positions to shift letters by. - mode (str): Determines whether to "encode" (shift forward) or "decode" (shift backward).

Abstract: This tutorial focuses on the research aimed at providing secure data processing at the public cloud. First, we focus on cryptographic (encryption and secret-sharing) techniques and systems ...