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Question: which of the following was the first poly graphic cipher...

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Which of the following was the first poly graphic cipher to be able to operate on more than 3 letters at once?
a) autokey cipher
b) hill cipher
c) one time pad cipher
d) playfair cipher
 

 

Which of the following is hardest to break using frequency analysis?
a) Vigenere cipher
b) Hill cipher
c) Caesar cipher
d) Affine cipher

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