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

Free substitution cipher tool with a live letter-translation grid, shareable keyPattern string, and letter-frequency bars. Map every ciphertext letter to any plaintext letter and switch to the autosolver when …

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 …

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 …

Paste your cipher text in to the text box and click Analyze. You will be provided with two tabs showing the frequencies of your cipher text, use the dropdowns or the buttons to quickly 'try out' different …

You can use the form below to perform substitution on a text: either to encode a text using a substitution cipher or as a helper in trying to decode one. Just type the text into the text area, in place of the …