Week 3 Module 1

Question 1

In PKI the ingredients of Trust are what?

Answer 1

Authentication
Confidentiality
Data Integrity
Non-repudiation

Question 2

What is Non-repudiation?

Answer 2

prevention of an entity to deny previous actions

Question 3

________ is the protection of information from unauthorized disclosure.

Answer 3

Confidentiality

Question 4

The Credential in PKI is the binding of the ______ with a ______ Key.

A. Private
B. Public
C. Subject Identity
D. Digital Identity

Answer 4

C. Subject Identity

B. Public

Question 5

Confidentiality is provided by the sender encrypting contents using the recipient’s _________. Decryption by the recipient is done using the recipient’s _______.

Answer 5

Public Key

Private Key

Question 6

Digital Signatures provide _____ and ______.

Answer 6

integrity

non-repudiation

Question 7

The status of a certificate can be checked using the ________ or _______.

A. Certificate Revocation List
B. Certificate Status List
C. Online Certificate Status Protocol
D. Online Revocation Status List

Answer 7

A. Certificate Revocation List

C. Online Certificate Status Protocol

Question 8

The _______ manages the certificate lifecycle and is the trusted party, among other things.

Answer 8

Certificate Authority (CA)

Question 9

The CA can delegate the _______ to identity and authenticate subscribers, but it cannot issue certificates.

Answer 9

Registration Authority (RA)

Question 10

A _______ is an electronic site that holds certificates and certificate status information.

A. database
B. repository
C. certificate store
D. none of the above

Answer 10

B. repository

Question 11

___________ is the process of establishing trust in a CA, starting from a CA you already trust.

A. Certificate Trust Validation
B. Certificate Link Validation
C. Certificate Path Validation
D. None of the above

Answer 11

C. Certificate Path Validation

Question 12

A _______ is a trust model where the CA issues certificates to users/systems, but not other CAs. Not very scalable.

Answer 12

Single CA

Question 13

In a ______ PKI model, the CAs have a superior-subordinate relationship.

Answer 13

Hierarchical

Question 14

A _______ PKI model links two PKI Domains.

Answer 14

Bridge

Question 15

True/False: Self-signed certificates are common and very trustworthy.

Answer 15

False

Question 16

Mary has a certificate from CA1. Joe has a certificate from CA 3. CA 1 issued CA2’s certificate. CA2 issues CA2’s certificate.
Does Joe Trust Mary’s Cert?

Answer 16

Yes (Hierarchical PKI)

Question 17

The top CA in a trust chain is called what?

Answer 17

Root CA