Week 8 - principles of cryptography

Question 1

Symmetric encryption is?

Answer 1

the same key used to encrypt and decrypt

Question 2

asymmetric cryptography?

Answer 2

2 keys, public and private 1 for encryption and one for decryption, thus not requiring key sharing.

Question 3

Diffie -Hillman (DH) key exchange is?

Answer 3

two parties agree on a large prime number used to calculate a public key

Question 4

Virtual Private Network (VPN)

Answer 4

a secure connection, IP hidden

Question 5

Internet Protocol Security (IPsec)?

Answer 5

protocols for secure connection, used for VPN, encrypts IP packets

Question 6

Transport Layer Security (TLS)?

Answer 6

encryption based protocol used on https sites, emails, instant message, voice over IP

Question 7

secure Shell (SSH)

Answer 7

used for remote command line, login, remote command executions

Question 8

Freshness is?

Answer 8

a measure of how recent a message or portion of data is

Question 9

Pretty Good Privacy (PGP) is?

Answer 9

exchanging messages with public keys, trust through web of trust

Question 10

Hybrid Cryptosystems?

Answer 10

a mixture of symmetric and asymmetric encryptions

Question 11

Rivest-Shamir-Adleman (RSA)?

Answer 11

protocol is a asymmetric encryption method

Question 12

Nonce

Answer 12

number only used once, to protect against replay attack