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

A Certificate Authority is a trusted entity that signs and issues digital certificates, binding public keys to identities within a PKI.

Question 2

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

Accepted Answer

A number used once to prevent replay attacks

Answer

A nonce (number used once) is a random or pseudo-random value included in cryptographic communications to ensure that old messages cannot be reused in replay attacks.

Question 3

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

Accepted Answer

TLS/SSL

Answer

TLS (Transport Layer Security), and its predecessor SSL, use cryptographic protocols to establish encrypted channels for HTTPS and other secure communications.

Question 4

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

Accepted Answer

Greater resistance to brute-force attacks

Answer

A longer key length exponentially increases the number of possible key combinations, making brute-force attacks computationally impractical.

Question 5

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

Accepted Answer

Interception by intermediaries, including service providers

Answer

E2EE ensures only the communicating users can read messages; even the service provider cannot decrypt the content because they never hold the keys.

Cyber Security Jobs Practice Test

Cyber Security Jobs Practice Test

Cyber Security Jobs Cryptography and Encryption 2