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9.12 LAB: The Caesar cipher In cryptography, Caesar's cipher is one of the simplest and most widely known encryption techniques. The method is named after Julius Caesar, who used it in his private communication. 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. We wish to implement Caesar's encryption scheme by substituting each alphabet in the string with another alphabet that occurs three shifts to its left. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. Note that that the code wraps around in that A would be replaced by X, B would be replaced by Y, and C would be replaced by Z. Write a function called encrypt that takes two input arguments: the plaintext and the number of left shifts to use when constructing the cipher, and returns the encrypted string. For example, if the user enters plaintext = "I CAME I SAW I CONQUERED" and shift = 3, then
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9.12 LAB: The Caesar cipher In cryptography, Caesar's cipher is one of the simplest and most widely...
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