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Flag Semaphore

Tool to decrypt/encrypt with semaphore flags. The semaphore alphabet is a visual communication system using hand-held flags by a standing man.

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Flag Semaphore -

Tag(s) : Communication System, Symbol Substitution

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Flag Semaphore

Semaphore Decoder



Semaphore Encoder





Answers to Questions (FAQ)

How to encrypt using Semaphore cipher?

The Semaphore encryption uses 2 flags (or other visual element, usually red and yellow) and a person, if possible standing (so as not to hinder arm movements).

Each letter as well as the character space is represented by a flag, the digits (1234567890) are represented by the letters from A to K.

Achar(65)Bchar(66)Cchar(67)Dchar(68)
Echar(69)Fchar(70)Gchar(71)Hchar(72)
Ichar(73)Jchar(74)Kchar(75)Lchar(76)
Mchar(77)Nchar(78)Ochar(79)Pchar(80)
Qchar(81)Rchar(82)Schar(83)Tchar(84)
Uchar(85)Vchar(86)Wchar(87)Xchar(88)
Ychar(89)Zchar(90)
dCode.fr

Example: 'FLAG' translates to char(66)char(100)char(71)char(65)

There are 5 special flags:

char(99) which signals a pause, a space, a rest, sometimes the end of the message

char(97) which indicates a switch from letters to digits

char(74) (=J) that indicates a switch from digits to letters

char(98) which indicates an error or danger ()

char(100) which indicates an annulation (ignore/disregard previous signal) (🗙)

The flags are presented in the reception mode, the transmitter looks towards the receiver (a person emitting a message will have to imagine the character mirrored).

How to decrypt Semaphore cipher?

Semaphores signals decryption is done by matching the positions of the flags with the letters of the alphabet.

Example: char(83)char(69)char(77)char(65)char(80)char(72)char(79)char(82)char(69) translates to SEMAPHORE

How to recognize a Semaphore ciphertext?

The message consists of humanoids with flags (or any other object) presented at the end of a stretched arm with multiple angles of 45 degrees (0, 45, 90, 135, 180, 225, 270, 315, 360).

Any reference to the aviations, planes, or boats, the places where these flags are used is a clue.

What are the variants of the Semaphore flag cipher?

Clock hands (set to hours, half hours or quarter hours) are a way of hiding semaphores.

Sometimes the flags are used to code Morse, with 2 defined positions corresponding to point and dash.

Maritime signal codes uses another principle of flags to encode words.

When Semaphore flags have been invented ?

The system of flags and the alphabet spread throughout the world in the 19th century.

Source code

dCode retains ownership of the online "Flag Semaphore" source code. Except explicit open source licence (indicated CC / Creative Commons / free), the "Flag Semaphore" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or the "Flag Semaphore" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, copy-paste, or API access for "Flag Semaphore" are not public, same for offline use on PC, tablet, iPhone or Android ! Remainder : dCode is free to use.

Need Help ?

Please, check our dCode Discord community for help requests!
NB: for encrypted messages, test our automatic cipher identifier!

Questions / Comments

Thanks to your feedback and relevant comments, dCode has developed the best 'Flag Semaphore' tool, so feel free to write! Thank you!


Source : https://www.dcode.fr/semaphore-flag
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