PDF Loads of Codes - Cryptography Activities for the Classroom
Loads of Codes ? Cryptography Activities for the Classroom
Paul Kelley Anoka High School Anoka, Minnesota
In the next 90 minutes, we'll look at cryptosystems: Caesar cipher St. Cyr cipher
Tie-ins with algebra
Frequency distribution Vigenere cipher
Cryptosystem ? an algorithm (or series of algorithms) needed to implement encryption and decryption.
For our purposes, the words encrypt and encipher will be used interchangeably, as will decrypt and decipher.
The idea behind all this is that you want some message to get somewhere in a secure fashion, without being intercepted by "the bad guys."
Code ? a substitution at the level of words or phrases
Cipher ? a substitution at the level of letters or symbols
However, I think "Loads of Codes" sounds much cooler than "Loads of Ciphers."
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