Alphabets (including symbols)
Monoalphabetic Substitution
Polyalphabetic Substitution
Esoteric computer languages
Base64 Image encode / decode
Links to usefull web sites for geocaching, especially mystery caching.
Cipher Types described by the American Cryptogram Association. A great source of information for understanding the workings of the ciphers (highlighted ciphers are inplemented in the Mystery Toolbox. = passed ACA test cipher)