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 ...

Hannah handed me a piece of paper with the following string of letters. “Each letter stands for another one,” said Hannah. “Ooh, a substitution cipher!” I thought. But I was stumped. “Is this just one ...

Fortnite Cipher Quests have an extra layer of complexity beyond the usual sets of assignments, as several of them are encrypted Cipher Quests that initially appear as a string of numbers. To work out ...