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Ciphering or encoding means making a piece of writing incomprehensible to those not in on the secret. Deciphering or decoding is the reverse process. A code is a table of words, abbreviations, numbers, or other symbols which can be substituted for words. You can even combine different symbols according to your needs.
Most people already know some simple codes. Perhaps you're familiar with the code which is created by reversing the alphabet— Z is substituted for A,Y for B, and so on. Or there is the code that simply uses numbers instead of letters, starting at any letter of the alphabet and going backward or forward.
You can make such simple codes more difficult if you combine them. For example, you might replace the first and last letters of a word by the letters immediately following them in the alphabet. It is a good idea to break up long words into two parts when using this code.
WE ARE WAITING FOR YOU XF BRF XAITINH GOS ZOV
In addition, you could also encode the result with an alphabet of numbers.
Typewriter Code
If you know how to touch type with all ten fingers, you can construct a code by typing from a different basic position. For example, instead of resting your left fingers on asdf and the right on jkl;, shift them a line up on the keyboard to qwer and uiop. Thus, when you type
wait for us,
it comes out:
2q85 r94 7w.
Strip Writing
You do not need a key to read or write this remarkable code. All that is necessary is a rod or a stick. However, you have to be careful that the sender's and receiver's sticks are exactly the same size. For this purpose, two pieces of the same broomstick are ideal.
If you are the one who is sending the message, wrap a strip of paper around the rod so that the edges touch each other, and fasten the ends with thumbtacks. Then, write the message along the rod, turning it a bit after each line. To send the message, simply take off the strip and roll it up. Anyone intercepting the message will rack his brains trying to figure it out. But the intended receiver merely has to wrap the strip around his half of the stick, and he can read the message without any trouble.
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