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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, Substitution Cipher

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# Flag Semaphore

## Semaphore Encoder

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

### How to encrypt using Semaphore cipher?

The Semaphore encryption uses 2 flags (or other visual element) 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.

Example: DCODE is translated

There are 3 special flags:

Which allows to pass from the digits to the letters

Which allows to pass from letters to numbers

Which indicates an error or danger

Example: A1 is translated

On this page, the flags are presented in the reception mode (a person emitting a message will have to imagine the character mirrored).

### How to decrypt Semaphore cipher?

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

Example: 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).

### What are the variants of the Semaphore flag cipher?

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.