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The War of Codemakers & Codebreakers etin Kaya Ko koc@cs.ucsb.edu

Summary: The War of Codemakers & Codebreakers
Çetin Kaya Koç koc@cs.ucsb.edu
Since the time of Caesar or even earlier, people are interested
in "secret communications"
Caesar Generals
Communication Line
To hide the content of his messages from the enemy, Caesar
developed "an encryption method" = Caesar Cipher
Caesar Cipher
For every letter in the word, replace the letter with the letter
3 locations ahead in the alphabet
a b c d e f g h i j k l m n o p q r s t u v w x y z
For example, if Caesar wants to send the order "attack", he
encrypts it as:
attack -> dwwdfn
and sends it to his General.
The enemy also captures the message and sees "dwwdfn".
But the enemy does not know what that means!!


Source: Akhmedov, Azer - Department of Mathematics, University of California at Santa Barbara


Collections: Mathematics