What is Substitution cipher?

A substitution cipher replaces each unit of plaintext with another according to a fixed rule. Simple versions preserve letter frequencies, which is what makes frequency analysis effective against them.

3 tools that work with Substitution cipher

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Text Tools1

Letter Frequency AnalyserCount letter and character frequencies — useful for cryptograms and puzzle solving.

Encoders & Decoders2

Caesar Cipher EncoderEncrypt and decrypt text with a Caesar shift cipher, including ROT13.ROT13 & ROT-N CipherShift letters by any amount — ROT13, ROT47 and every rotation in between, with a full table.

Related terms

Terms that appear alongside Substitution cipher on the same tools.

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