or the Baconian cipher
is a method of steganography
(a method of hiding a secret message as opposed to a true cipher
) devised by Francis Bacon
. A message is concealed in the presentation of text, rather than its content.
To encode a message, each letter of the plaintext
is replaced by a group of five of the letters 'A' or 'B'. This replacement is done according to the alphabet of the Baconian cipher, shown below.
a AAAAA g AABBA n ABBAA t BAABA
b AAAAB h AABBB o ABBAB u-v BAABB
c AAABA i-j ABAAA p ABBBA w BABAA
d AAABB k ABAAB q ABBBB x BABAB
e AABAA l ABABA r BAAAA y BABBA
f AABAB m ABABB s BAAAB z BABBB
A second version of Bacon's cipher uses a unique code for each letter. In other words, I
each has its own pattern.
The writer must make use of two different typefaces
for this cipher. After preparing a false message with the same number of letters as all of the As
in the real, secret message, two typefaces are chosen, one to represent As
and the other Bs
. Then each letter of the false message must be presented in the appropriate typeface, according to whether it stands for an A
or a B
To decode the message, the reverse method is applied. Each "typeface 1" letter in the false message is replaced with an A
and each "typeface 2" letter is replaced with a B
. The Baconian... Read More