Key: The key is case-sensitive and must be between 1 and 64 alphanumeric characters long. Space (" ") and period (".") are also supported. You can generate a random key for the strongest encryption.

Base64: Enabling base64 allows all characters to be used and can create a stronger key if the original key is short. If the base64 includes "/" or "+", these characters will be replaced by space and period respectively.

Group size: The encryption process occurs in blocks, using chunks of the input and mixing them together. Group size determines how many characters will be encrypted together at a time. If multiple group sizes are entered the encryption will cycle through them. A group size of "1" will not provide encryption.

Input: Acceptable characters for input are: A-Z, a-z, 0-9, space (" "), and period (".") If you include other characters you must sanitize the input or the encryption process will fail.

Sanitize: Sanitizing the text remove all other characters, symbols, and punctuation. Exclamation marks ("!") and question marks ("?") will be converted to periods. Only sanitize the text when encrypting.

The keyed alphabet takes your key, removes duplicates, and appends all remaining characters (A-Z, a-z, 0-9, space, and period) to the end. A longer key creates a more unique alphabet. This 64-character alphabet is used to fill the cipher table below.

The cipher table arranges the keyed alphabet onto an extended (8x8) Polybius square which is used to encrypt or decrypt the message.

Input characters are identified by their location along three pairs of rows and columns (identified by 0 and 1). The location data is mixed together and new output characters are derived. This method combines transposition and fractionation to achieve diffusion.

You can click a letter in the table to see the location data for that letter.