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Navy Signals Code

Tool to decrypt/encrypt with flags automatically. International Maritime/Navy signals code is a code substituting flags to letters.

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Navy Signals Code -

Tag(s) : Communication System, Symbol Substitution

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Navy Signals Code

Navy Signal Flags Decoder

Navy Flags Encoder



Tool to decrypt/encrypt with flags automatically. International Maritime/Navy signals code is a code substituting flags to letters.

Answers to Questions

How to encrypt using Navy Signals cipher?

The International Code of Maritime Signals uses flags for communication purposes. It can be used as a mono-alphabetical substitution cipher, each nautical flag represents a letter of the alphabet.

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)

Example: 'FLAG' is coded char(70)char(76)char(65)char(71)

How to decrypt Maritime Signals cipher?

The Decryption of Maritime Signals flags is a substitution between a flag and a letter except for 4 flags: char(107)char(108)char(109)char(110) which are used to repeat the previous one.

Example: char(68)char(67)char(79)char(68)char(69) is translated DCODE.

How to recognize Maritime Flag ciphertext?

The ciphered message is made of flags (squared) in basic colors: blue, white, yellow, red, black (no green and no compound colors) offering a large contrast.

Flags used in navy, do not necessarily mean a distress signal, they can handle a radio problem and help ship navigation.

All references to the navy, naval forces (Royal Navy, US Navy etc.) and ships in general are clues.

What are the variants of the Maritime alphabet?

NATO uses 10 other flags to code digits.

What is the reference book for Maritime Signals?

The French reference book is available here (link)

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