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Basics of Cryptography: Caesar Cipher
In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a shift of +3 (to rigth) word "B" will become "E".
Step 1: Creating the Cipher
Step 2: Using Words As Key
nstead of using numbers we can use words as keys.
To do that; choose a word, remove the surplus letters from the word and write the rest of the alphabet next to it.
(Do not write the letters which are on your word as well.)
If we were to make "POTATO" our key than it would be left "POTA" and when you write rest of the alphabet without "P","O","T","A" letters you will be able to encrypt and decrypt the letter. In that case the word " instructables" will be "fkrsqutspoibr".
Step 3: Using Multiple Numbers As Keys
*Instead of using one number for whole letter you can use multiple. For example if you take "123" as key -the number can be big as you want- while encrypting "CAT", decryption will be "DCW".
*You can do the same thing using words instead of letters. For example in the sentence "Hello World" you can use "-1,2" and you will do the same thing but in the word "Hello" you will use "-1" and in " World" you will use "2".
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