by sunny mahesh and andy yuwen. cryptography = secret messages = cool stuff ciphers difference...
Post on 01-Apr-2015
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Cryptography By Sunny Mahesh and Andy Yuwen
What is Cryptography • Cryptography = Secret Messages = Cool Stuff• Ciphers• Difference between plaintext and ciphertext• Enciphering and Deciphering
Substitution Ciphers
Hill Ciphers • Hill Ciphers encode messages of plaintext in
successive pairs.• For a Hill n-cipher, pairs of length n are taken and
are enciphered by a n by n matrix•
Hill Cipher Example Part 1•
Hill Cipher Example Part 2•
Hill Cipher Example Part 3•
Modular Arithmetic
• A Cooler Way To Do Math
Reciprocal Mods
•
Inverse of a Matrix mod 26
• Why are we still doing this? Because we’re cool, Dealz with it
Example of Inverse of a Matrix mod 26
•
Decoding
•
Decoding #hardcore#jamesbondstyle
•
Decoding #hardcore#jamesbondstyle
•
Decoding #hardcore#jamesbondstyle#2
•
Decoding #theeasypart#3
•
Mission Accomplished, JK
• OK. Now Its Your Time Secret Agents. Complete the final mission and receive your award.
• We have intercepted the code
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