How to Write an Unbreakable Code

Step-by-Step Guide

1. 1

   Step 1: Write the message at the top of a piece of paper.

   Our message is hello. , Hello becomes 8 5 12 12
   15. , You only need as many letters as there are in the message.
   
   Using our one-time pad, these are abgsd.
   
   This is the key. , The key is now 1 2 7 19
   4. , Add the first letter of the message to the first letter of the key, second to second, etc.
   
   Our codetext is 9 7 19 31
   19. , Our codetext becomes 9 7 19 5
   19. , Our codetext message is IGSES. , This is why it is a one-time pad: each part is used once.
   
   If it's written on paper, tear it off and burn it.
   
   Our one-time pad is now peycnghf. ,
2. 2

   Step 2: Convert it into numbers.

3. 3

   Step 3: Write down the letters of the one-time pad underneath.

4. 4

   Step 4: Convert the key into numbers.

5. 5

   Step 5: Add together the corresponding numbers to get the codetext.

6. 6

   Step 6: For every number over (not equal to) 26

7. 7

   Step 7: subtract 26.

8. 8

   Step 8: Convert back into letters.

9. 9

   Step 9: Destroy the part of the one-time pad that you used.

10. 10

    Step 10: Send the message.

Detailed Guide

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