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Polyalphabetic Cipher

As Ciphers got more advanced people came up with ways to make decoding a message harder. The Polyalphabetic Cipher uses the Rot Cipher and a Key Word and A1Z26.
1.  Pick out a keyword. The longer it is, the more secure you code will be. I will be using "code" as my key word for this example.
2.  Use A1Z26 to encode your key word.  "Code" would become "3-15-4-5"
3.  Write your message with the key underneath, like this...                                     b  e  s  t  c  o  d  e s     i  s    a w e  s  o m  e
                                                                                                                                3-15-4-5-3-15-4-5-3   15-4   5-3-15-4-5-3-15
4.  Shift each letter in the plain text by the number below it.                                     e  t  w  y  f  d  h  j  v     x  w    f  z  t  w  t  p  t 
bestcodes is awesome = etwyfdhjv xw fztwtpt 
5. To decode just use the key word and do the opposite of how you encode.
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