3-24.3

Question 1

What is hashing and what is it used for?

Answer 1

Hashing proves integrity. The output is known as a message digest.

Question 2

What are some common hash functions?

Answer 2

MD5 (Broken but can be used for non crypto), SHA2 and 3, and RIPEMD (Bitcoin).

Question 3

What is a hashed MAC?

Answer 3

Hashed value that included a symmetric key. Used by IPSEC and TLS.

Question 4

What is salting (salting the hash)?

Answer 4

Random values appended to hashed to negate rainbow tables.

Question 5

What is a digital signature and what is its purpose?

Answer 5

Message digest that has been encrypted using the senders private key. The objective is to prove integrity and non-repudiation so signer cannot deny the message.

Question 6

What are common digital signature algorithms and what do they contain?

Answer 6

Digital signatures have two algorithms, a hash function and digital signature algorithm. RSA is a commercial standard and DSA is an government.