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Now this method only works if you have the proper key to stick in the lock, and your key will be valid only as long as you are the resident of the particular abode.The next resident will have the locks changed to a different key to make sure that you cannot enter even though you may know the method.(I told you the difference was fuzzy, and you can combine codes and ciphers by substituting one word for another and then mixing up the result.) We'll concentrate on ciphers.For a cipher to be useful, several things must be known at both the sending and receiving ends.The easier the algorithm you choose, the more often you will have to change the key that unlocks the code - if you want to keep your enemy in the dark.
Businesses also send data that has been encoded to try and protect trade secrets and back-room deals.Or perhaps you remember using special symbols to write notes to your "squeeze" in class.If the note was intercepted , your teacher, could learn nothing about your romance.The Captain Midnight decoder ring (which is an "encoder" ring as well) allows you to do a simple substitution cipher.It usually has two concentric wheels of letters, A through Z.
On the other hand, you must also assume that your opponent has intercepted your enciphered message and is busy trying to break it.