2018-Codebusters-Coaches-Institute-Notes.pdfGreat Starting Resource to teach you about most the cyphers
Cryptogram/ Aristocrats practice problems
How to solve Aristocrat cypher
How Aristocrat-K1 cyphers work
Solving a Railfence Cipher
Solving a Vigenère and Caesar Cipher
Solving a Pollux / Morbit Cypher