Unit 2: Cryptography

Which of these is a modern application of cryptography?

• Email encryption

• Stone carving

• Painting

• Cooking

What does the term 'encryption' mean in cryptography?

• To decode a message

• To encode a message

• To delete a message

• To forward a message.

Which of these is a tool used in cryptography?

• Enigma machine

• Typewriter

• Paintbrush

• Compass

Which icon is associated with smart home technology?

• House with Wi-Fi

• Credit Card

• Lock with Asterisks

• Hand with Coin

What does the icon with a dollar sign represent?

• Financial Matters

• Health Monitoring

• Internet Connectivity

• Security

Which of the following statements is true about decryption?

• A) It makes a message unreadable

• B) It converts plaintext to ciphertext

• C) It converts ciphertext to plaintext

• D) It requires no key

What is a substitution cipher?

• A method to change one character or symbol into another

• A method to multiply numbers

• A method to divide numbers

• A method to add numbers.

If the key is 3, what is the encoded text for 'ATTACK TONIGHT' using the Caesar cipher?

• DWWDFN WRQLJKW

• CXXDLQ WRQLJKW

• DXXDFN WRQLJKW

• DWWDFN WRQLJKW

If the key is 3, what is the decoded text for 'DWWDFN WRQLJKW' using the Caesar cipher?

• ATTACK TONIGHT

• DEFEND NOW

• RETREAT TODAY

• ADVANCE TOMORROW

What is the original message in the Caesar cipher example?

• ATTACK TONIGHT

• DEFEND TODAY

• RETREAT NOW

• ADVANCE TOMORROW