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Clock Cipher

Tool to encode/decode with clocks (Clock cipher) by associating to times, letters of the alphabet or numbers.

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Clock Cipher -

Tag(s) : Symbol Substitution

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NB: for encrypted messages, test our automatic cipher identifier!


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Clock Cipher

Clock Decoder

Click on clocks or type them with 'hh:mm' format

Answers to Questions (FAQ)

What is the Clock Cipher?

The clock cipher is the name given to any type of encryption / code linking clocks (usually with hands) with letters of the alphabet.

There are several ways of associating time/hours with letters, none is ideal, especially since by limiting the hours to 15-minute increments, a clock has 48 configurations for 26 letters.

How to encrypt using Clock cipher?

Clock code encryption associates a letter of the alphabet with a schedule. More exactly, it is the position of the hands which is important because 00h00 and 12h00 are identical.

To encode a message, the sender of the message must choose a method to encode the letters. There are several possible:

Example: 00:00 = A, 01:00 = B, ..., 11:00 = 'L, 00:30 = M, ... 11:30 = X

Example: 01:00 = A, 02:00 = B, ..., 11:00 = 'L, 00:30 = L, ... 11:30 = W

Example: 00:00 = A, 00:15 = B, 00:30 = C, ...

Example: 00:15 = A, 00:30 = B, 00:45 = C, ...

The coded message is then represented in the form of needle clocks.

Example: char(48)char(49)char(50)char(51)

How to decrypt Clock cipher?

Deciphering the clock code requires knowing the correspondence between the hours and the letters.

dCode automatically tries all known variants (by brute-force).

How to recognize a Clock ciphertext?

The message is made up of hours, clocks, pendulums, all rounded to a quarter of an hour (therefore with a step of 15 minutes).

Source code

dCode retains ownership of the online 'Clock Cipher' tool source code. Except explicit open source licence (indicated CC / Creative Commons / free), any 'Clock Cipher' algorithm, applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any 'Clock Cipher' function (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and no data download, script, copy-paste, or API access for 'Clock Cipher' will be for free, same for offline use on PC, tablet, iPhone or Android ! dCode is free and online.

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 'Clock Cipher' tool, so feel free to write! Thank you!


Source : https://www.dcode.fr/clock-cipher
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