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Baudot Code

Tool to decode/encode with Baudot. Baudot code is one of the first telecommunication code in binary from a machine, it uses 5 bits per character and 2 character sets.

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Baudot Code -

Tag(s) : Communication, Character Encoding

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# Baudot Code

## Baudot Encoder

 Least Significant Bit (LSB) On left (12-345) On right (543-21)

Tool to decode/encode with Baudot. Baudot code is one of the first telecommunication code in binary from a machine, it uses 5 bits per character and 2 character sets.

### How to encrypt using Baudot cipher

Encryption with the Baudot code uses a coding alphabet on 5 bits and 2 sets of characters (usually one for letters and the other for numbers and punctuation). The coding alphabet depend on the machine (Baudot type) used.

Encryption consists in transcribing the characters of the message by their code. To switch between character sets, there are two keys: and .

Example: Consider the message to be encoded IA2 BAUDOT, with a machine using the international telegraphic alphabet no. 2 (the most widespread).

Example:

LetterCodeNotes
I00110By default the letter character set is used
A00011
11011The next character (2) is a number (therefore absent from the letters' character set), type ⇧ (switch to digits)
210011
(space)00100The space code is the same for each character sets (numbers and letters) in the international alphabet 2
11111The next character (B) is a letter (thus absent from the digits' character set), type ⇩ (switch to letters)
B11001
A00011
U00111
D01001
O11000
T10000

Example: the coded message is then 00110 00011 11011 10011 11111 11001 00011 00111 01001 11000 10000.

### How to decrypt Baudot cipher

Decryption with the Baudot code requires knowing the machine and / or the alphabet used. The decoding consists simply of replacing the 5-bit groups (0 and 1) by their corresponding character in the alphabet.

When the code corresponds to (digits to letters) or (letters to numbers), the character set must be changed.

Example: Consider the encrypted message 01001 01110 11011 10110 11111 01001 11011 00001

 01001 01110 11011 10110 11111 01001 11011 00001 D C ⇧ 0 ⇩ D ⇧ 3

Example: The plain message is DC0D3.

### How to recognize an Baudot ciphertext?

The message is a binary code, usually 0 and 1.

The code consists of a number of bits multiple of 5.

### What is the Least significant bit first?

When coding the binary message, usually one write the value 3 as 00011, with the most significant bit first (the least significant bit the right). One can write also 11000, with, this time, the least significant bit first, on the left.

### What is the International Alphabet n°2?

IA2 is the Baudot variant the most used, here are the codes and their characters:

CodeLettersDigits
00000nullnull
00100espaceespace
10111Q1
10011W2
00001E3
01010R4
10000T5
10101Y6
00111U7
00110I8
11000O9
10110P0
00011A-
00101SBELL
01001D\$
01101F!
11010G&
10100H#
01011J'
01111K(
10010L)
10001Z"
11101X/
01110C:
11110V;
11001B?
01100N,
11100M.
01000Carriage Return CRCarriage Return CR
00010Line Feed LFLine Feed LF
11011Switch to Digits

### What is the WRU code?

On some machines, there was a WRU key (for who are you) which allowed you to request the identification of communicating people.

### When Baudot Code have been invented ?

End of the XIXe century (>1870)