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Tap code is a code similar to Morse code and is commonly used by prisoners in jail to communicate with one another. The method of communicating using this code is usually by "tapping" either the metal bars or the walls inside the cell, hence, it got the name "Tap Code". It is a very simple code, not meant to avoid interception, since the messages are sent in cleartext.
It was reportedly invented by four POWs imprisoned in Vietnam and is sometimes called "Smitty Code" after Captain Carlyle "Smitty" Harris. Captain Harris had an Air Force Instructor who had shown him a code based on a five-by-five alphabet matrix, which is the Polybius square (see attached photo).
Each letter was communicated by tapping two numbers. The first 'tap' is designated to the horizontal row and the second is designated to the vertical row. The letter "X" was used to break up sentences (as a 'space') and the letter "C" replaced the letter "K".
For example, to communicate the word "WATSON" the code would be the following:
••••• •• • • •••• •••• •••• ••• ••• •••• ••• •••
Because of the difficulty and the length of time required for specifying a single letter, most prisoners devised abbreviation and acronyms for common items or phrases.
[GAME] Try to decipher this code. PM Swordcane for answers! Don't put your answers in the comment section.
