In cryptography, substitution is one of the two basic encryption classes.

The characters are changed according to a fixed procedure.

If only one alphabet is used, this is called monoalphabetic substitution, otherwise polyalphabetic substitution.

If only one character is substituted at a time, it is called a monographic substitution; otherwise it is called a bi-/polygraphic substitution.

GCWizard knows the following substitution encodings:

• Abaddon – monoalphabetic, monographic
• ADFG(V)X – monoalphabetic, monographic
• Affine – monoalphabetic, monographic
• Atbash – monoalphabetic, monographic
• Bacon – monoalphabetic, monographic
• Bifid – monoalphabetic, monographic
• Caesar – monoalphabetic, monographic
• Chao – monoalphabetic, monographic
• Enigma – polyalphabetic, monographic
• Gronsfeld – polyalphabetic, monographic
• Homophon – monoalphabetic, monographic
• Kamasutra – monoalphabetic, monographic
• Tapcode – monoalphabetic, monographic
• Mexican Cipher Wheel – monoalphabetic, monographic
• One-Time-Pad – polyalphabetic, monographic
• Playfair – monoalphabetic, bigraphic
• Polybios – monoalphabetic, monographic
• RSA – monoalphabetic, monographic
• Solitaire – monoalphabetic, monographic
• Straddling Checkerboard – monoalphabetic, monographic
• Tapir – monoalphabetic, monographic
• Trifid – monoalphabetic, monographic
• Trithemius – polyalphabetic, monographic
• Vigenère – polyalphabetic, monographic