Chapter 4 Cryptography

Which of the following is a ciphertext?

• Used for encryption and decryption.

• Transformation of plaintext.

• Cleartext message sent by sender to recipient.

• Encrypted message.

Which of the following are the 2 different types of encryption algorithm?

• Asymmetric algorithm

• Secret Key algorithm

• Symmetric algorithm

• One Way Hash

  algorithm

Which of the following is NOT a characteristic of Symmetric algorithm?

• Also known as Secret Key Algorithm.

• Sender and recipient need to share a common secret key.

• Public key Algorithm.

• Uses the same key (symmetric/secret key) for encryption and decryption.

Which of the following are the issues of using a symmetric algorithm?

(Choose all that applies)

• Need shared key

• Need to exchange secret key

• Sender and recipient may not know each other

• Sender and recipient know each other

What are the 2 factors that affect the security of encrypted data?

• Strength of cryptographic algorithms.

• Distance between sender and receiver.

• Secrecy .

Which of the following are the characteristics of asymmetric algorithm?

• Public Key Algorithm.

• Single Key Algorithm.

• Public and private keys are mathematically related.

• Private key – known only to the owner and cannot be derived from encryption key.

Which of the following is a problem of asymmetric algorithm?

• Distance is too far.

• Sender and recipient may not know each other.

• is typically slower (~1000 times) than symmetric algorithm.

• Both sender and recipient will have the same secret key for symmetric cryptography operations.

What are the functions of the Digital Signature?

(Choose all that applies).

• Confidentiality.

• Authenticity.

• Integrity.

• Non-repudiation.