Cyber Security Cryptography 2

Question 1

What is PKI (Public Key Infrastructure) primarily responsible for?

Accepted Answer

Issuing and managing digital certificates for trusted identities

Answer

Managing firewall rules

Answer

Encrypting database records

Answer

Scanning for vulnerabilities

Question 2

Which key is used to encrypt a message so that only the intended recipient can decrypt it?

Accepted Answer

The recipient's public key

Answer

The sender's private key

Answer

A shared symmetric key

Answer

The CA's root key

Question 3

What does salting a password hash protect against?

Accepted Answer

Rainbow table and precomputed hash attacks

Answer

Brute force via CPU speed

Answer

Man-in-the-middle attacks

Answer

Session hijacking

Question 4

Which mode of AES operation turns the block cipher into a stream cipher by XORing plaintext with an encrypted counter?

Accepted Answer

CTR

Answer

ECB

Answer

CBC

Answer

OFB

Question 5

What is forward secrecy in TLS?

Accepted Answer

Generating unique session keys so past sessions remain secure if long-term keys are compromised

Answer

Using the same key for all sessions for consistency

Answer

Requiring client certificates in all TLS handshakes

Answer

Encrypting the TLS handshake with a pre-shared key

Question 6

What type of attack attempts every possible key combination until the correct one is found?

Accepted Answer

Brute force attack

Answer

Dictionary attack

Answer

Side-channel attack

Answer

Birthday attack