Baconian
The Baconian cipher is a substitution cipher where the letters of the alphabet are represented by binary patterns of length 5 using 'A' and 'B' instead of '0' and '1'.
Explanation
The Baconian cipher, also known as the Baconian alphabet or Bacon's cipher, is a type of substitution cipher used for encoding and decoding messages.
In the Baconian cipher, each letter of the alphabet is replaced by a sequence of five characters, consisting of 'A' and 'B'.
These characters represent the binary encoding of the letter, where 'A' stands for one binary digit (usually 0) and 'B' stands for the other binary digit (usually 1).
During encoding I and J are generally encoded as the same letter.
To encode a message using the Baconian cipher, each letter of the plaintext is replaced by its corresponding binary sequence according to the table above. Spaces and punctuation are typically ignored.
The Baconian cipher is relatively easy to encode and decode, especially with the aid of a table or key. However, it provides only limited security against modern cryptanalysis techniques and is mainly of historical interest.
Facts
It was developed by Sir Francis Bacon in the late 16th century."There is a theory that he developed the cipher to conceal his authorship of Shakespeare's works, though there is no conclusive evidence support this theory.
Sir Francis Bacon has also been proposed as the author behind the Voynich manuscript, which remains undeciphered to this day.