Ceaser Cipher

What is the primary function of a Caesar Cipher in cryptography?

• To compress data

• To encrypt messages

• To generate random numbers

• To store data

In a Caesar Cipher, if the original letter is 'D' and the shift is 3, what is the encrypted letter?

• G

• F

• E

• H

Explain how you would decrypt a message encrypted with a Caesar Cipher with a known shift value.

• Reverse the alphabet

• Apply the same shift in the opposite direction

• Use a different cipher

• Guess the original message

Which of the following is a limitation of the Caesar Cipher in terms of security?

• It requires a complex algorithm

• It is vulnerable to frequency analysis

• It uses too much computational power

• It cannot encrypt numbers

If a message is encrypted using a Caesar Cipher with a shift of 5, what is the shift value needed to decrypt it?

• 5

• -5

• 26

• 21

Describe a scenario where a Caesar Cipher might still be useful today despite its security limitations.

• Encrypting military communications

• Securing online banking transactions

• Teaching basic cryptography concepts

• Protecting sensitive government data

How does frequency analysis help in breaking a Caesar Cipher?

• By identifying the most common letters in the ciphertext

• By using a brute force attack

• By changing the shift value

• By encrypting the message again

What is the result of encrypting the word "HELLO" using a Caesar Cipher with a shift of 2?

• JGNNQ

• IFMMP

• GDKKN

• HFNOS

Why is the Caesar Cipher considered a substitution cipher?

• It substitutes each letter with a number

• It substitutes each letter with another letter

• It substitutes words with symbols

• It substitutes sentences with codes

Plan a method to determine the shift value used in a Caesar Cipher if you have both the encrypted and original message.

• Compare the first letters of both messages

• Use a random number generator

• Count the number of letters in the message

• Use the length of the message