Telephone Cipher

Code machines – or cipher machines – can be used to encode and decode messages. One everyday example of a code machine that you can easily access is a telephone. Watch this video and I’ll show you how it works.


Download Student Worksheet & Exercises

What do you think about the Telephone Code? Remember to get those slash codes just right in order to make decoding easier for the message receiver. (No pun intended!)

Exercises

Encode the following using the telephone keypad:

  1. COME BACK
  2. LEAVE TODAY
  3. HE ARRIVED
  4. THEY WENT
  5. HE IS COMING
  6. REVEAL
  7. GO AHEAD

Decode the following ciphers

  1. 1 6 3 7 4   2  2
  2. 8 64  8 3   3 5 4 6 4   3 6  6
  3. 2 8 7  8 7   2 5 4 2