ENCRYPTION

Part 1:
Simple Encryption & Secret Keys

Review / Caesar Cipher

(stop 2:09)

Random Substitution Cipher

Solvable using frequency analysis

3D data visualization sculpture by Mike Knuepfel

Height = frequency of letter use

Vigenere Cipher

???

Encryption with a "SECRET KEY"

Work with a partner:

• Explore the Vigenère Cipher Widget to figure out how it works – the link is on our class website
   
• Complete both sides of the activity guide (everyone should turn in their own)

keys are "computationally hard"

too many possibilities to compute in a reasonable amount of time

(stop 4:10)