Certified Ethical Hacker Cryptography Fundamentals 2

Question 1

Which encryption type uses the same key for both encryption and decryption?

Accepted Answer

Symmetric encryption

Answer

Asymmetric encryption

Answer

Hashing

Answer

Steganography

Question 2

What is the key size used by the AES algorithm in its strongest standard configuration?

Accepted Answer

256 bits

Answer

56 bits

Answer

128 bits

Answer

512 bits

Question 3

Which of the following is a stream cipher?

Accepted Answer

RC4

Answer

AES

Answer

Blowfish

Answer

3DES

Question 4

In asymmetric cryptography, which key is used to encrypt a message sent to a recipient?

Accepted Answer

The recipient's public key

Answer

The sender's private key

Answer

The recipient's private key

Answer

A shared symmetric key

Question 5

What property of a hash function ensures it is computationally infeasible to find two inputs producing the same output?

Accepted Answer

Collision resistance

Answer

Reversibility

Answer

Confidentiality

Answer

Key exchange

Question 6

Which algorithm is primarily used for secure key exchange over an insecure channel?

Accepted Answer

Diffie-Hellman

Answer

MD5

Answer

AES

Answer

SHA-256

Question 7

What does a digital signature primarily provide?

Accepted Answer

Authentication and integrity

Answer

Confidentiality only

Answer

Faster encryption

Answer

Key generation