Bacon Cipher

Bacon's encryption uses a substitution alphabet based on 2 letters (called biliteral), often A and B, replacing the letters of the alphabet.

This encryption method is often accompanied by over-encryption.

Baconian encryption uses the substitution table:

Example: DCODE is encrypted AAABB,AAABA,ABBAB,AAABB,AABAA

In this original alphabet, the letter V does not exist, it is replaced by U, likewise the letter J does not exist, it is replaced by I.

Another bacon's alphabet is sometimes preferred, more complete, it uses a unique code for each letter:

The 2-letter code used can be hidden in an over-encryption. A classic method is to write a random message with upper case (for A) or lower case (for B) or vice versa; in this case see the binarization of uppercase and lowercase. Other methods are possible such as writing certain characters in italics (or in bold), or even mixing 2 fonts.

Baconian decryption is a substitution with the biliteral alphabet of Bacon.

Example: AAABB AAABA ABBAB AAABB AABAA is equivalent to DCODE.

If over-encryption has been applied, convert the message into 2 characters (preferably A and B) first.

The ciphered message is a biliterary code (binary with 2 letters), and maybe spaces every 5 characters.

All references to Françis Bacon (and its homonyms), to Novum organum, or to bacon slices (pork, larding, smocked, salted, english breakfast, etc.) are clues.

The letters A and B can be replaced by others characters, such as 0 and 1, to transform the message into binary format.

Sometimes the letters o and l are used: lolol loolo lolol.

The over-encryptions (of the steganographic type) are sometimes used to mask the biliteral form (upper case, lower case, variant characters or fonts, etc.).

Francis Bacon first described it around 1605