Tool to encode/decode with clocks (Clock cipher) by associating to times, letters of the alphabet or numbers.
Clock Cipher - dCode
Tag(s) : Symbol Substitution
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Clock Cipher
Clock Decoder
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.
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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
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Cite as source (bibliography):
Clock Cipher on dCode.fr [online website], retrieved on 2024-05-12,
