Calculator encrypts entered text by using Caesar cipher. Non-alphabetic symbols (digits, whitespaces, etc.) are not transformed.

This calculator uses Hill cipher to encrypt/decrypt a block of text.

This calculator allows you to encrypt and decrypt text with Atbash method

A1Z26 is very simple direct substitution cypher, where each alphabet letter is replaced by its number in the alphabet.

This online calculator can decode message written with standard galactic alphabet symbols

This article contains two calculators, first can be used to encode message with the rail fence cipher, second can be used to crack message encoded with the rail fence cipher by brute force. Decoded simply outputs decoded message for different number of "rails".

This online calculator decrypts digits encrypted by PATHFINDER type of cipher.

This online calculator encrypts and decrypts a message given Playfair cipher keyword. Non-alphabetic symbols (digits, whitespaces, etc.) are ignored.

This online calculator can decode messages written with Bill's symbol substitution cipher

This online calculator can decode messages written in the Author's symbol substitution cipher

This online calculator can decode messages written in the pigpen cipher

This online calculator calculates index of coincidence (IC, IOC) for the given text

This online calculator tries to decode Vigenère cipher without knowing the key. It uses the index of coincidence technique.

A tool to encrypt/decrypt messages with a simple substitution cipher given as the key. It is also useful for manual cryptanalysis of a substitution cipher - when you have a message written in the English alphabet partially decrypted with an automatic tool and want to tweak the key.

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. Note that you may need to run it several times to find completely accurate solution. The calculator logic is explained below the calculator.

This online calculator performs Kasiski examination of an entered text using trigrams in attempt to discover a key length

This online calculator applies Caesar cipher not only to the letters, but to the numbers as well. Numbers expands the alphabet and are included to the rotations. Other symbols except letters and numbers are not transformed.

This online calculator allows users to encode and decode messages using the A2Z52 cipher.