If you’ve every noticed closely on you telephone keypad, each number 2-9 matches up with a letter.

2 = A, B, or C

3 = D, E, or F

4 = G, H, or I

5 = J, K, or L

6 = M, N, or O

7 = P, Q, R, or S

8 = T, U, or V

9 = W, X, Y, or Z

Here is an example of a telephone keypad cipher

Message: “x marks the spot”

Cipher: 9627578437768

Telephone keypad ciphers can be a bit tricky as each number could still represent up to 3 different letters. For example in the above cipher, if someone was trying to decipher it, they may think the first letter in the message was “W” instead of “X” since 9 could represent “W”, “X”, “Y” or “Z”

Another way to use the Telephone Keypad Cipher is to use it to encipher a number message. A problem here is that the numbers 1 and 0 are not represented so characters would have to be created to represent those numbers.

An example of using a telephone keypad cipher to encipher your locker combination

Combination: 23-45-37

Cipher: ADHLER

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