Module 16: Basic Integrity and Authenticity

Question 1

Four elements of Secure comminication

Answer 1

Data Integrity
Origin authentication
Data Confidentiality
Data Non-Repudiation

Question 2

What is a Cryptographic Hash Function

Answer 2

hashing is a one way mathematical function that is easy to compute but hard to reverse - takes a variable block of data and produces a fixed length hash

Question 3

What threat is hashing vulnerable to?

Answer 3

Man in the Middle Attacks

Question 4

What is a HMAC

Answer 4

a Authenticated Hash

Question 5

What does a HMAC provide?

Answer 5

authentication for the hash

Question 6

What is Key Length

Answer 6

the size of the key in bits

Question 7

What is Keyspace

Answer 7

the number of possibilities that can be generated by a key

Question 8

What is used to provide confidentiality

Answer 8

AES and 3DES

Question 9

What is a Stream Cipher

Answer 9

Encrypts plaintext one byte at a time - faster then a block cipher

Question 10

What is a Block Cipher

Answer 10

Transforms a fixed length block of plaintext into ciphertext

Question 11

Asymmetric Encryption examples

Answer 11

IKE
TLS
SSH
PGP
DHKE