# Cipher Encoder

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Substitution ciphers are one of the simplest forms of encryption, where replacement rules are provided that map each letter of the alphabet onto a different letter.

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Contributed by: Jon McLoone (March 2011)

Open content licensed under CC BY-NC-SA

## Snapshots

## Details

Ciphers are not "public key" encryption, as the decode key is a simple inversion of the encode key and so must be securely transmitted to the recipient of the message. Ciphers can also be broken by frequency analysis without the need for the key, as long as enough encrypted text is available.

## Permanent Citation

"Cipher Encoder"

http://demonstrations.wolfram.com/CipherEncoder/

Wolfram Demonstrations Project

Published: March 7 2011