The answer to the riddles are then used as keys to a Caesar shift cipher. So for cipher #1 we use 19 as the key and replace each letter with the one 19 places before it in the alphabet. You could do ...

A few months ago, GeekDad's Challenge of the Week was a lovely cipher about famous novels beginnings. I enjoyed solving it and that reminded me of a time where I was teaching younger students (12 to ...

Introduction to ciphers and substitution. Alice and Bob and Carl and Julius: terminology and Caesar Cipher ; The key to the matter: generalizing the Caesar Cipher ; Multiplicative ciphers ; Affine ...