Cipher Visualizer

XOR, substitution, and frequency analysis, made visible. Companion worksheet →

What this is for

XOR is reversible: (plain XOR key) XOR key = plain. Frequency analysis breaks every classical substitution cipher on natural-language text: a paragraph of English ciphertext gives away its shift in one histogram inspection. Predict by hand first, then let the tool confirm or correct you.

Plaintext Key

Plaintext

Caesar shift: 3

cipher:

Ciphertext (English plaintext under a Caesar shift)

cipher frequencyreference English

cipher letter frequency

reference English frequency

Try shift back by: 0

decrypted: