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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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.
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.
Deciphering the clock code requires knowing the correspondence between the hours and the letters.
dCode automatically tries all known variants (by brute-force).
The message is made up of hours, clocks, pendulums, all rounded to a quarter of an hour (therefore with a step of 15 minutes).
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Cite as source (bibliography):
Clock Cipher on dCode.fr [online website], retrieved on 2022-09-30,