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 translator with a live letter-translation grid, shareable keyPattern string, and frequency bars. Map each ciphertext letter to any plaintext letter, keep your formatting, …

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 …

Crafted by Wierk. A monoalphabetical substitution cipher uses a fixed substitution over the entire message. The ciphertext alphabet may be a shifted, reversed, mixed or deranged version of …

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 …

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

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 …

Enter a keyword, phrase or alphabet and the rest will be calculated for you.