Encryption and Cryptography Quiz

What is the primary purpose of encryption?

• To reduce data size

• To increase data redundancy

• To speed up data transmission

• To hide the original message

Who was Caesar's Cipher named after?

• Augustus Caesar

• Julius Caesar

• Marcus Aurelius

• Nero

How many possible keys are there in Caesar's Cipher for the English alphabet?

• 10

• 26

• 100

• 52

What is a major flaw of Caesar's Cipher?

• It only works with numbers

• It requires a computer to decrypt

• It can be easily cracked by trying all possible keys

• It is too complex to use

What is the advantage of using a 10-digit key over Caesar's Cipher?

• It requires less computational power

• It is easier to remember

• It has fewer possible solutions

• It is harder to guess

How long would it take a modern computer to try all 10 billion possibilities of a 10-digit key?

• A few days

• A few minutes

• A few hours

• A few seconds

What is the key length used in today's secure communications?

• 128-bit

• 192-bit

• 256-bit

• 512-bit

What is symmetric encryption?

• Encrypting data without a key

• Using the same key for both encryption and decryption

• Using different keys for encryption and decryption

• Encrypting data with multiple keys

Why is symmetric encryption not suitable for the open internet?

• It is too slow

• It requires a private key exchange

• It is too expensive

• It is not secure enough

What is the main feature of asymmetric encryption?

• It is only used for military purposes

• It uses a public key for encryption and a private key for decryption

• It does not require a key

• It uses the same key for both encryption and decryption