PKI

Question 1

Digest Algorithm

Answer 1

The hash function used to verify the integrity of the message/input to ensure that it has not been tampered.

e.g., SHA, MD5, Blake2

Question 2

SHA1, SHA256, SHA-3

Answer 2

Hash functions used to verify data integrity. SHA256 is used in common applications such as TLS/SSL

Question 3

RSA-SHA

Answer 3

Combination of an asymmetric encryption algorithm and a hash function used in digital signature creation.

Question 4

Encryption algorithm

Answer 4

A symmetric or asymmetrical function to ensure the confidentiality of data being transmitted. This ensures that only the intended parties can read the information.

Question 5

RSA

Answer 5

Asymmetric encryption algorithm that has both parties use a private+public key pair exchange during session setup.

Often used with AES during TLS/SSL sessions.

Question 6

AES

Answer 6

Encryption algorithm that supports up to 256bit keys. Efficient speed-wise while maintaining security (especially when 256 bit is used).

Question 7

Diffie-Hellman (DH)

Answer 7

Key exchange process in which two parties agree to generate a shared secret without sharing the actual key over the network. This is done by both parties agreeing on a mathematical function to use and then using the key pairs to compute the shared secret on their own.

DH helps with forward secrecy

Question 8

DH Group

Answer 8

Used during key exchange to determine the parameters for establishing a shared secret