The Vigenère cipher is a method of encrypting alphabetic text by using a simple form of polyalphabetic substitution. Essentially it is a series of interwoven caesar ciphers, however it uses a word as a key instead of a number or series of numbers.
Think to yourself…
What benefits could this have?
What would it reduce?
Have a go at a Polyalphabetic Cipher here.
Is it effective?
Whilst a Vigenére Cipher is more difficult to break with brute force, it is more effective than a simple Ceasar Cipher. However, it can be broken if the length of the keyword is guessed.
How does it work?
The Vignére Cipher uses a Vignére square to encrypt and decrypt text.
Let’s give it a go…
Joe’s favourite type of pizza is?
CSTWZG
Key: CYBER
Race for the Code
Aims:
Be the first team to find the secret code and tell it to the teacher to win.
Rules:
Respect other classrooms by not disrupting others classes in the area.
Strictly paper and pen.
Don’t fight, have fun!