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Binary and Logic L7 - Caesar Cipher Encryption

Last updated 9 months ago
17 questions
Lesson intentions To know that text can be protected using “encryption”
Success Criteria:
1: Be know that encryption turns plain text into cipher text
2: To be able to encrypt and decrypt messages
3: To be aware of disadvantages of using the caesar cipher.
Caesar Cipher: A method of "Encrypting" messages by "Shifting" the alphabet by a certain amount.

Encryption:
Turning "plain text" into "Cipher text". This makes it so that people without the "key" cannot understand it.

Decryption:
Turning "Cipher Text" into "Plain text"

Key: The method in encrypting and decrypting. Only you and the person you are sharing with should know this key.
1

Match the keyword to the definition

Draggable itemCorresponding Item
Caesar Cipher
Shifting the alphabet by a certain key
Encryption:
Turning "plain text" into "Cipher text".
Key
Turning "Cipher Text" into "Plain text"
Cipher text
How much you shift the alphabet by to decrypt and encrypt
Decryption
An encrypted message
1

The Image shows a Caesar Cipher wheel. It has a key of 3.

So to ENCRYPT the letter A, it moves 3 spaces to the right. You look at the outer ring then replace it with the letter in the inside ring.
What does the letter A turn into?

1

The Image shows a Caesar Cipher wheel. It has a key of 3.

So to ENCRYPT the letter B, it moves 3 spaces to the right. You look at the outer ring then replace it with the letter in the inside ring.

What does the letter B turn into?

1

The Image shows a Caesar Cipher wheel. It has a key of 3.

You look at the outer ring then replace it with the letter in the inside ring.

Encrypt the message "Hello".

1

The Image shows a Caesar Cipher wheel. It has a key of 3.

You look at the outer ring then replace it with the letter in the inside ring.

Encrypt the message "Bye".

1

The Image shows a Caesar Cipher wheel. It has a key of 3.

So to DECRYPT the letter D, you look for this letter in the inner circle, then use the letter on the blue ring.

What does D decrypt to?

1

The Image shows a Caesar Cipher wheel. It has a key of 3.

So to DECRYPT the letter E, you look for this letter in the inner circle, then use the letter on the blue ring.

What does D decrypt to?

1

The Image shows a Caesar Cipher wheel. It has a key of 3.

You look at the outer ring then replace it with the letter in the inside ring.

Decrypt the message "phulw"

1

Use the website: https://caesar-cipher.com/caesar-cipher-wheel

Work out my secret message: Hfjxfw Hnumjw
Key: 5

1

Use the website: https://caesar-cipher.com/caesar-cipher-wheel

Encrypt the message: Mr Chau
Key: 7

1

Use the website: https://caesar-cipher.com/caesar-cipher-wheel

Work out my secret message: Em apitt uizkp ib liev.
Key: 8

1

Use the website: https://caesar-cipher.com/caesar-cipher-wheel

Work out my secret message: Ovanel naq Ybtvp
Key: 13

1

Use the website: https://caesar-cipher.com/caesar-cipher-wheel

Encrypt the message: Caesar Cipher
Key: 17

1

Use the website: https://caesar-cipher.com/caesar-cipher-wheel

Encrypt the message: Password
Key: 17

1

What is a disadvantage of using the Caesar Cipher?

0

Create your own secret message

https://cryptii.com/pipes/caesar-cipher

1

Go onto
https://learncomputing.org/binary
and do some revision for converting binary to denary or vise versa
or some binary addition.
Screenshot your progress.