Bacon cipher - online encoder / decoder- Online calculators

Key
Letter:	a	b	c	d	e	f	g	h
Code:	AAAAA	AAAAB	AAABA	AAABB	AABAA	AABAB	AABBA	AABBB
Letter:	i-j	k	l	m	n	o	p	q
Code:	ABAAA	ABAAB	ABABA	ABABB	ABBAA	ABBAB	ABBBA	ABBBB
Letter:	r	s	t	u-v	w	x	y	z
Code:	BAAAA	BAAAB	BAABA	BAABB	BABAA	BABAB	BABBA	BABBB

Bacon's cipher

Bacon's cipher is a simple substitution cipher in which the ciphertext consists of five-letter strings consisting of the letters A and B.

Francis Bacon developed this method of hiding one message in another. This is not a real cipher, but just a way to hide secret text from being read directly.

The Bacon cipher is actually a method of steganography (a method of hiding a secret message as opposed to a cipher) developed by Francis Bacon in 1605. The message is hidden in the presentation of the text, not in its body.

There are two versions. The first uses the same code for I and J and for U and V. The second uses different codes for each letter.

Each letter of plaintext is replaced by a group of five letters 'A' or 'B'. This conversion is binary encoding and follows the Bacon cipher alphabet (from the Latin alphabet) as below:

Letter	Code	Binary
A	aaaaa	00000
B	aaaab	00001
C	aaaba	00010
D	aaabb	00011
E	aabaa	00100
F	aabab	00101
G	aabba	00110
H	aabbb	00111
I, J	abaaa	01000
K	abaab	01001
L	ababa	01010
M	ababb	01011

Letter	Code	Binary
N	abbaa	01100
O	abbab	01101
P	abbba	01110
Q	abbbb	01111
R	baaaa	10000
S	baaab	10001
T	baaba	10010
U, V	baabb	10011
W	babaa	10100
X	babab	10101
Y	babba	10110
Z	babbb	10111

The second version of the Bacon cipher uses a unique code for each letter. In other words, I , J , U , and V have their own separate code:

Letter	Code	Binary
A	aaaaa	00000
B	aaaab	00001
C	aaaba	00010
D	aaabb	00011
E	aabaa	00100
F	aabab	00101
G	aabba	00110
H	aabbb	00111
I	abaaa	01000
J	abaab	01001
K	ababa	01010
L	ababb	01011
M	abbaa	01100

Letter	Code	Binary
N	abbab	01101
O	abbba	01110
P	abbbb	01111
Q	baaaa	10000
R	baaab	10001
S	baaba	10010
T	baabb	10011
U	babaa	10100
V	babab	10101
W	babba	10110
X	babbb	10111
Y	bbaaa	11000
Z	bbaab	11001

In the original, the author used two different typefaces to hide the true content. Different typeface for A and different for B.

For example, we want to hide the word "MESSAGE" and encode it in some body that will appear to be plain text. By encrypting the word MESSAGE with the Bacon code, we will get ABABBAABAABAAABBAAABAAAAAABBAAABAA . The original secret message (MESSAGE) is 7 characters long, so the encoded version is 7 * 5 = 35 characters. We find a sentence with 35 letters, it could be "In this text is hidden a top secret message". Now we change the typeface. For each B, we will use bold italics and leave A unchanged.

AB ABBA ABAA BA AABBAA A BAA AAAAAB BAAABAA
In this text is hidden a top secret message

So our open message in which we encoded the secret text would look like this "In this text is hidden a top secret message".

If I wanted to decrypt the secret information, it would be enough if I would substitute A for each normally written letter, and B for the letter written in bold italics. Put the obtained result into the decoder or check it in the table.

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Bacon cipher - online encoder / decoder

Bacon cipher - encoder / decoder