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SECRET CODES - Part 5

The secret of this code is in shifting two alphabets.

1. ABCDEFGHIJKLMNOPQRSTUVWXYZ—message letters

2. BCDEFGHIJKLMNOPQRSTUVWXYZA—code letters Take the code letter under the message letter in the first alphabet. For example, HURRY UP becomes IVSSZ VQ. The code can be varied by shifting the second alphabet a different number of letters.

Code Box

Divide the alphabet into nine groups and number them, starting in the upper left-hand corner. ABC=1, MNO=5, VWX=8, etc. In each group the letters are numbered 1 to 3. In this way, each letter of the alphabet is designated with two numbers. In the empty spot in box 9 you can add an e> the letter which occurs most frequently in English. Thus, you can use either 22 or 93 for e, thereby making it more difficult for outsiders to break the code. O, for example, is the third letter in box 5. Therefore 53=0. In this code, BEWITCHED becomes: 12/22/82/33/72/13/32/93/21, or, more simply, 1222823372133293-21.

For a variation, instead of numbering each group of letters in a box from 1 to 3, number them continuously. In this code, s is 7/19, for the 7th box and the 19th letter. Then SALT would be 7/19-1/1-4/12-7/20.

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