Public Key Infrastructure (PKI) Quiz
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Questions and Answers

What is the primary purpose of a Public Key Infrastructure (PKI)?

  • To manage hardware components in a network.
  • To facilitate secure electronic communication. (correct)
  • To maintain digital certificates only.
  • To enforce user password policies.
  • Which component of a PKI is responsible for issuing and signing digital certificates?

  • Validation Authority (VA)
  • Certificate Authority (CA) (correct)
  • Registration Authority (RA)
  • Encryption Authority (EA)
  • What must a person present to the Registration Authority (RA) when requesting a personal certificate?

  • A social security card.
  • A government-issued identification.
  • A passport or similar identification. (correct)
  • Proof of address document.
  • What does the PKI bind public keys to?

    <p>Identities.</p> Signup and view all the answers

    Which of the following is NOT a component of a standard PKI design?

    <p>Identity Authority (IA)</p> Signup and view all the answers

    In what situation is a PKI particularly necessary?

    <p>For security in electronic transactions.</p> Signup and view all the answers

    How is proof of ownership of a public key established within a PKI?

    <p>Through the issuance of a certificate.</p> Signup and view all the answers

    What is required for a web server to request a certificate from a CA like Let's Encrypt?

    <p>Registration of a public key.</p> Signup and view all the answers

    What is required to verify the validity of a request for a certificate?

    <p>Access to the server must be proven.</p> Signup and view all the answers

    Which of the following is a challenge used by Let's Encrypt for certificate requests?

    <p>HTTP-01</p> Signup and view all the answers

    What is the role of the Validation Authority (VA) in a PKI design?

    <p>To verify the validity of issued certificates.</p> Signup and view all the answers

    What happens if a Certificate Authority's root certificate is compromised?

    <p>All certificates issued by the CA must be revoked.</p> Signup and view all the answers

    In the Web of Trust model, what does Alice need to do to trust Bob's public key?

    <p>Sign Bob's public key.</p> Signup and view all the answers

    Which of the following is a disadvantage of using a CA as a root of trust?

    <p>Trust is centralized around the CA.</p> Signup and view all the answers

    What is the main purpose of DNS-01 challenge in certificate requests?

    <p>To set up a special DNS record.</p> Signup and view all the answers

    Which statement about the CA, RA and VA is correct?

    <p>The VA verifies issued certificates.</p> Signup and view all the answers

    Study Notes

    Public Key Infrastructures (PKI)

    • PKI is a set of roles, policies, hardware, software, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates and manage public-key encryption.
    • The purpose of PKI is to facilitate secure electronic communication for electronic transactions (e.g., banking, shopping). It's essential when simple password authentication isn't sufficient.
    • From a process perspective, PKI links public keys to identities. A public key must be registered within the PKI, proving the identity of the key's owner.
    • Successful registration results in a certificate that verifies the public key's ownership.

    PKI Components

    • A PKI consists of several components:
      • Certificate Authority (CA): Stores, issues, and signs digital certificates. The CA acts as a trusted third party. Both the owner and verifier of a certificate must trust the CA.
      • Registration Authority (RA): Verifies the identity of individuals or organizations requesting a certificate. For personal certificates, the requester must be physically present and show identification (e.g., passport). For functional certificates, other identity verification methods are used. Verification of identity using Let's Encrypt involves specific challenges (HTTP-01 and DNS-01) to prove access to the server.
      • Validation Authority (VA): Verifies the validity of issued certificates. The CA provides a list of revoked certificates to the validation authority. Crucially, the validation authority is publicly accessible.

    Problems with a CA

    • Relying on a single Certificate Authority (CA) as the root of trust has drawbacks:
      • Every party must trust the CA.
      • If the CA's root certificate is compromised, every other certificate issued by that CA must be revoked.

    Alternative to a CA: Web of Trust

    • Web of Trust is a decentralized trust model.
    • Basic idea: Alice signs Bob's public key; if Carol trusts Alice, she also trusts Bob's public key.
    • Alice needs a trustworthy method for verifying Bob's public key.
    • Trust can be direct or indirect, potentially involving multiple individuals or entities.

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    Related Documents

    Public Key Infrastructures PDF

    Description

    Test your knowledge on Public Key Infrastructure (PKI) and its components. This quiz covers the roles, policies, and procedures that ensure secure communication for electronic transactions. Understand the significant elements like Certificate Authorities and Registration Authorities within a PKI system.

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