PKI

Question 1

What are two alternatives to PKI?

Answer 1

• Diffie-Helman provides a method for key exchange using a one-way function without the need of PKI (encrypting the symmetric key with the recipient’s public key) for safe key exchange.
• Knapsack is an alternative public encryption method for creating a public key and a private key.

Question 2

standard for cryptographic syntax and encrypting messages using PKI

Answer 2

PKCS 7

Question 3

standard for certificate signing requests

Answer 3

PKCS 10

Question 4

standard for bundling multiple certificates together for transport

Answer 4

PKCS 12

Question 5

These are exchanged at the start of a conversion to authenticate each device.

Answer 5

X.509v3 digital certificates which contain the public keys

Question 6

lightweight public key along with a Diffie-Hellman related handshake between the RFID tag and the RFID reader in RFID implementations.

Answer 6

Elli

Elliptic Curve light

Question 7

What is PKI?

Answer 7

the framework for issuing, distributing, storing, using, and verifying digital certificates; also used for managing public-key (AKA asymmetric) encryption

Question 8

uses modular exponentation

Answer 8

DSA

Question 9

Used in both encryption and digital signing

Answer 9

EL Gamal

Question 10

What is the difference between HMAC and a digital signature?

Answer 10

• Digital signatures - Provides non-repudiation through PUBLIC-PRIVATE ASYMMETRIC KEYS.
• HMAC- Providing integrity for large data transfers, using SHARED SYMMETRIC KEY.

Question 11

HMAC is created with what hash typically?

Answer 11

SHA-1, MD-5, Chaskey

Question 12

what supports homomorphic encryption?

Answer 12

The Paillier cryptosystem

Question 13

one-way hashing method which protects

against an adaptive chosen ciphertext attack.

Answer 13

Cramer-Shoup

Question 14

public key method that is used in both encryption and digital signing. It is used in many applications and uses discrete logarithms.

Answer 14

El-Gamal