This online calculator tries to decode substitution cipher without knowing the key. It uses genetic algorithm over text fitness function to break the encoded text.

Tool to encrypt / decrypt a message by substitution cipher (all sizes) by replacing one or more characters with one or more others

A simple substitution cipher rearranges the alphabet so every ciphertext letter consistently stands in for another letter or symbol. This page is a complete guide to substitution ciphers plus a hands-on tool …

As an example here is an English cryptogram this tool can solve: A Python implementation of this breaker is provided on GitLab. If you want to break a polyalphabetic cipher instead try the Vigenère …

Alphabetical substitution cipher: Encode and decode online A monoalphabetical substitution cipher uses a fixed substitution over the entire message. The ciphertext alphabet may be a shifted, reversed, …

Decode any substitution cipher instantly with our advanced AI-powered solver. Features automatic detection, interactive mapping, and step-by-step assistance. Decode substitution ciphers with …

Interactive substitution cipher solver. Paste ciphertext, try frequency analysis, edit the letter mapping, auto-suggest keys with hill-climb heuristic and decode messages client-side.

Free online Simple Substitution cipher tool. Encrypt and decrypt text using a custom alphabet mapping with interactive visualization and key generation options.

Free substitution cipher tool with custom alphabet keys. Encode and decode messages using monoalphabetic substitution. Generate random keys, visualize alphabet mapping, and learn about …

Keyword cipher decoder online. Decode keyword substitution ciphers with frequency analysis.