Substitution Cipher with Example
In this tutorial, we are going to see Substitution Cipher with Example.
Substitution Cipher consists in replacing one or several entities (generally letters) in a message by one or several other entities.
Several types of substitution cryptosystems are generally used:
- Monoalphabetic substitution consists in replacing each letter of the message by another letter of the alphabet
- Polyalphabetic substitution consists in using a monoalphabetic sequence of numbers reused periodically
- Homophonic substitution allows matching each letter of the message with a possible set of other characters
- Polygram substitution consists in substituting a group of characters (polygram) in the message by another group of characters
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Example of Substitution Cipher:

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