Lesson Objectives
- understand the term Cryptology- use different encryption methods to solve coded messages
Starter
Cryptology Sheet - HERE
Research Questions
1. What is Cryptology?
2. What is a Cipher?
3. Find examples of different ciphers and explain how they're used?
Main
Red Task
1.Make notes and draw the diagram below in your book to explain the following:
a. Plain Text
b. Encryption
c. Cipher Text
d. Decryption
2. Let's see if you can decrypt some 'simple' ciphertext - HERE
Amber Task
A Substitution Cipher is one in which letters are represented by other letters, such as the Caesar Cipher.
In pairs, make your own Cipher Wheel and create 3 short coded messages, changing the Shift Value each time. Ask another pair to try and crack your coded messages.
Green Task
Use the website The Black Chamber to explore Substitution Ciphers further and find out more about Frequency Analysis.
In your book answer the following question:
What is Frequency Analysis and how does it help with code breaking?
Extension
Rail Fence Encryption is another type of encryption.
Have a go at completing the following:
Plenary
Add a new post to your Blog entitled Cryptology Useful Websites
Practical Cryptography
Top 10 Unbreakable Ciphers
Virtual Cipher Wheel
Cryptology Games
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