Cryptography Quiz

What is the main purpose of cryptography?

• To compress data

• To make data look interesting

• To keep data secure and private

• To delete sensitive data

In a Caesar Cipher with a shift of 3, what is the encrypted form of “HELLO”?

• KHOOR

• IFMMP

• JGNNQ

• DWWOH

Which of these best describes public-key cryptography?

• One key is used to encrypt and decrypt

• Both keys must be kept secret
  

• A public key encrypts, a private key decrypts

• You need to meet in person to exchange keys

What is the primary weakness of a substitution cipher?

• A. Too expensive
  

• B. Requires computers
  

• C. Easy to decode using frequency analysis
  

• D. Needs quantum computing

What does HTTPS use to keep data secure?

• A. Morse code
  

• B. Caesar Cipher
  

• C. TLS/SSL encryption
  

• D. QR codes

What is a digital signature used for?

• A. Encrypting photos

• B. Signing physical documents
  

• C. Verifying the identity and integrity of digital messages
  

• D. Drawing on tablets

Password hashing is the same as encryption.

• True

• False

In the Diffie-Hellman exchange, both parties end up with the same secret without directly sharing it.

• True

• False

What is the main difference between symmetric and asymmetric encryption?

How does frequency analysis help in breaking a substitution cipher?