I. Explain how in a substitution cipher you substitute one value for another.
II. Describe a type of substitution based on a monoalphabetic substitution and how it only uses one alphabet whereas a polyalphabetic substitution uses at least two alphabets and are more advanced in nature.
III. An advanced type of substitution cipher that uses a simple polyalphabetic code is the Vigenère cipher. Ongoing information security activities provide the appropriate support to the goals aligned with the agency mission.