Substitution Ciphers

Substitution ciphers are about replacing every group of plaintext letters with another predefined group. For decrypting, a reverse substitution should be used.

There are four main categories of substitution ciphers:

Simple Substitution Ciphers

Simple substitution cipher image

Simple substitution ciphers replace each plaintext character with another predefined character.

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Homophonic Substitution Ciphers

Homophonic substitution cipher image

Homophonic substitution ciphers replace each plaintext character with one of a few characters available.

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Polygraphic Substitution Ciphers

Polygraphic substitution cipher image

Polygraphic substitution ciphers, in which the whole groups of characters are substituted.

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Polyalphabetic Substitution Ciphers

Polyalphabetic substitution cipher image

Polyalphabetic substitution ciphers, in which each plaintext character is replaced with another, constantly changing character.

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