MATA02H3 Lecture 4: 4. Cryptography- The Encryption Process
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MATA02H3 Full Course Notes
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Julius caesar created secret messages by shifting each letter three letters forward in the alphabet (sending the last three letters to the first three letters. ) For example, the letter b is replaced by e and the letter x is replaced by a. This process of making a message secret is an example of encryption. If we assign numbers to each letter in the alphabet (a, b, c, d, z to be represented by some numbers as shown below) we can then code a message using some laws of the. Magic of numbers, we learned in this course. The idea is that only by knowing the key of the coded message, one can figure out the meaning of the message. Replace each letter by an integer in (mod 26), that is an integer from 0 to 25 (i) representing one less than its position in the alphabet. (ii)
