Cyber Security Jobs Cryptography and Encryption 2

Question 1

What is the role of a Certificate Authority (CA) in a Public Key Infrastructure?

Accepted Answer

To issue and validate digital certificates

Answer

To encrypt network traffic between endpoints

Answer

To store users' private keys securely

Answer

To generate and distribute symmetric keys

Question 2

In cryptography, what is a 'nonce' primarily used for?

Accepted Answer

A number used once to prevent replay attacks

Answer

A type of private encryption key

Answer

A variant of a hashing algorithm

Answer

A standardized certificate format

Question 3

Which protocol primarily uses cryptography to secure web (HTTPS) communications?

Accepted Answer

TLS/SSL

Answer

FTP

Answer

HTTP

Answer

SMTP

Question 4

What does a longer key length generally indicate about an encryption algorithm?

Accepted Answer

Greater resistance to brute-force attacks

Answer

Faster encryption and decryption speed

Answer

A different underlying algorithm type

Answer

A larger encrypted output file size

Question 5

What is end-to-end encryption (E2EE) specifically designed to protect against?

Accepted Answer

Interception by intermediaries, including service providers

Answer

Physical theft of the user's device

Answer

Password brute-force and credential stuffing attacks

Answer

Malware installed on endpoints

Question 6

Why is a 'salt' added to a password before hashing it?

Accepted Answer

To prevent rainbow table attacks

Answer

To speed up the hashing computation

Answer

To reduce the length of the hash output

Answer

To encrypt the resulting hash value

Question 7

In asymmetric encryption, which key does the sender use to encrypt a message for a recipient?

Accepted Answer

The recipient's public key

Answer

The sender's private key

Answer

A shared symmetric session key

Answer

A temporary one-time key