We spent time earlier this year learning how a substitution cipher that goes all the way back to Julius Caesar has been used throughout history. We made our own cipher wheels in class and enciphered our own messages. You've even cracked a couple on this blog!
The Caesar Cipher
All Hail the Newest Code Challenge
Well, the Caesar Cipher worked pretty well for a few hundred years, but eventually a really smart Arab mathematician figured out how to crack it using a method called "frequency analysis." The video below from KhanAcademy.com explains.
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