Alphanumeric Substitution Cipher

An alphanumeric substitution cipher is any code or cipher that represents numbers through letters and/or letters through numbers. The most common of these ciphers is an A1Z26 cipher, in which all letters of the Latin alphabet are represented by their numerical position from A to Z. While other variations exist, including those using pre-established libraries of number-character connection (such as ASCII and Unicode) or alternative alphabets, most puzzles that utilize one of these use the A1Z26 version.