17 Security

Question 1

Block Cipher

Answer 1

The encryption of a number of contiguous bits in one go rather than one bit at a time.

Question 2

Block chaining

Answer 2

Form of encryption where previous block of cipher text and then encrypted thus preventing identical plaintext blocks producing identical cipher text.

Question 3

symmetric encryption

Answer 3

Encryption in which the same secret key key is used to encrypt and decrypt messages.

Question 4

Asymmetric encryption

Answer 4

Encryption that uses public and private keys.

Question 5

Quantum Cryptography

Answer 5

Cryptography based on the laws of quantum mechanics

Question 6

Quantum key distribution

Answer 6

protocol that uses quantum mechanics to secretly send encryption keys over fibre optic networks

Question 7

Secure Sockets Layer SSL

Answer 7

security protocol used when sending data over the internet

Question 8

Transport Layer Security TLS

Answer 8

more up to date version of SSL

Question 9

Digital Signature

Answer 9

A way of validating the authenticity of digital documents and identifying the sender

Question 10

Digital Certificate

Answer 10

An electronic document used to prove online identity of a website. it contains a public key and information identifying the owner of the certificate.

Question 11

List of items found in digital certificate:

Answer 11

version number, serial number of certificate, name of certificate issuer, validity, issuer’s identifier, company’s identifier, public key, signature algorithm used, digital signature.