Certified Ethical Hacker Cryptography Fundamentals 3

Question 1

Which hashing algorithm is considered broken and should not be used for security purposes?

Accepted Answer

MD5

Answer

SHA-256

Answer

SHA-3

Answer

bcrypt

Question 2

What technique adds random data to a password before hashing to defend against rainbow tables?

Accepted Answer

Salting

Answer

Padding

Answer

Chaining

Answer

Tunneling

Question 3

Which cipher mode requires an initialization vector (IV) to randomize the first block?

Accepted Answer

CBC

Answer

ECB

Answer

Plaintext mode

Answer

Hash mode

Question 4

Why is ECB mode generally discouraged for encrypting large amounts of data?

Accepted Answer

Identical plaintext blocks produce identical ciphertext

Answer

It is too slow

Answer

It requires asymmetric keys

Answer

It cannot use AES

Question 5

What is the primary purpose of a Certificate Authority (CA) in a PKI?

Accepted Answer

Issue and verify digital certificates

Answer

Generate symmetric keys

Answer

Encrypt all network traffic

Answer

Store passwords

Question 6

Which attack attempts every possible key until the correct one is found?

Accepted Answer

Brute-force attack

Answer

Replay attack

Answer

Phishing attack

Answer

SQL injection

Question 7

What does the 'integrity' goal of cryptography ensure?

Accepted Answer

Data has not been altered

Answer

Data is kept secret

Answer

Data is always available

Answer

Data is compressed