Question

Explain how any simple substitution cipher that involves a permutation of the alphabet can be thought of as a special case of this cipher.

Answer 1

A simple substitution cipher takes each vector ($e_i$) and assigns it to the vectors [$e_{\pi (i)}$] in a one-to-one function so as to make them equivalent.

What is the Hill cipher?

In 1929, the Hill cipher was invented by Lester S. Hill and it can be described as a poly-graphic substitution cipher that is typically based on linear algebra and it avails a cryptographer an ability to simultaneously operate on more than three (3) symbols.

In Cryptography, the simple substitution cipher is usually viewed as a function which takes each plaintext letter (alphabet) and assigns it to a ciphertext letter. Thus, it takes each vector ($e_i$) and assigns it to the vectors [$e_{\pi (i)}$] in a one-to-one function so as to make them equivalent.

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