Plaintext
HELLO
Bacon cipher (26 letters)
AABBB AABAA ABABB ABABB ABBBA
Encoding & Decoding
Bacon Cipher Encoder and Decoder
Encode and decode Bacon cipher messages with 24-letter or 26-letter alphabets. Five-symbol A/B groups are processed locally.
Bacon CipherCipherCTF
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Bacon Cipher
培根密码（Bacon's cipher）由法兰西斯·培根发明，将明文转换为只含 'A' 和 'B' 的序列。
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Use cases
- Create or solve A/B substitution puzzles
- Check which Bacon cipher alphabet a CTF challenge uses
- Learn a classic binary substitution cipher
How to use
- Enter plaintext or an A/B cipher
- Choose the 24- or 26-letter alphabet
- Encode or decode, then copy the result
Example input and output
FAQ
What is the difference between the 24- and 26-letter versions?
The 24-letter version combines I/J and U/V. The 26-letter version maps every modern A-Z letter separately.
Why does the encoded output only contain A and B?
Each letter is represented by five binary positions, with A and B standing for the two possible values.
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