Source: wikibot/substitution-cipher
= Substitution cipher
{wiki=Substitution_cipher}
A substitution cipher is a type of encryption technique where each letter in the plaintext is systematically replaced with another letter or symbol to create the ciphertext. The substitution can be done in various ways, such as using a fixed alphabet where each letter in the original message is replaced by a corresponding letter from a shuffled alphabet, or by using more complex keys.