Digital Certificates

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Questions and Answers

Which of the following is NOT a component of a digital certificate?

  • Private key (correct)
  • Certificate owner's information
  • Name of the issuing CA
  • Public key and its associated algorithm

What is the purpose of revoking a public key?

  • To extend its validity period
  • To distribute it widely
  • To avoid impersonation attacks (correct)
  • To increase its algorithm strength

How are public keys typically distributed?

  • On the owner's website
  • Via email
  • Certificate servers or directory servers (correct)
  • All of the above

What is a fingerprint (thumbprint) of a digital certificate?

<p>A hash of the certificate in hexadecimal format for easier manual checks (A)</p> Signup and view all the answers

What is a Certification Authority (CA) and a Registration Authority (RA) collectively known as?

<p>Public Key Infrastructure (PKI) (C)</p> Signup and view all the answers

What is the purpose of Domain Validation in certificate validation?

<p>To check if you control the domain (C)</p> Signup and view all the answers

What is the purpose of Extended Validation in certificate validation?

<p>To perform extensive checks on the organization (D)</p> Signup and view all the answers

What is the purpose of Organisation Validation (OV) in certificate validation?

<p>To check the existence of the organization owning the domain (A)</p> Signup and view all the answers

How do browsers verify the authenticity of a website's certificate?

<p>By verifying the issuing CA's signature on the certificate using the CA's public key (B)</p> Signup and view all the answers

What is the purpose of Certificate Revocation Lists (CRL)?

<p>To communicate revoked certificates (A)</p> Signup and view all the answers

What is the recommended method for storing private keys for individuals?

<p>Encrypted save on a computer's hard drive using a passphrase (A)</p> Signup and view all the answers

What is the purpose of Hardware Security Modules (HSM) or Trusted Platform Modules (TPM) in storing private keys for organizations?

<p>To store private keys and perform cryptographic computations (D)</p> Signup and view all the answers

Which of the following is NOT a component of a digital certificate?

<p>Private key (C)</p> Signup and view all the answers

What is the purpose of revoking a public key?

<p>To avoid impersonation attacks (C)</p> Signup and view all the answers

How are public keys typically distributed?

<p>Certificate servers or directory servers (A)</p> Signup and view all the answers

What is a fingerprint (thumbprint) of a digital certificate?

<p>A hash of the certificate in hexadecimal format for easier manual checks (D)</p> Signup and view all the answers

What is a Certification Authority (CA) and a Registration Authority (RA) collectively known as?

<p>Public Key Infrastructure (PKI) (A)</p> Signup and view all the answers

What is the purpose of Domain Validation in certificate validation?

<p>To check if you control the domain (A)</p> Signup and view all the answers

What is the purpose of Extended Validation in certificate validation?

<p>To perform extensive checks on the organization (D)</p> Signup and view all the answers

What is the purpose of Organisation Validation (OV) in certificate validation?

<p>To check the existence of the organization owning the domain (A)</p> Signup and view all the answers

How do browsers verify the authenticity of a website's certificate?

<p>By verifying the issuing CA's signature on the certificate using the CA's public key (D)</p> Signup and view all the answers

What is the purpose of Certificate Revocation Lists (CRL)?

<p>To communicate revoked certificates (C)</p> Signup and view all the answers

What is the recommended method for storing private keys for individuals?

<p>Encrypted save on a computer's hard drive using a passphrase (B)</p> Signup and view all the answers

What is the purpose of Hardware Security Modules (HSM) or Trusted Platform Modules (TPM) in storing private keys for organizations?

<p>To store private keys and perform cryptographic computations (B)</p> Signup and view all the answers

Which of the following is the purpose of revoking a public key?

<p>To prevent impersonation or man-in-the-middle attacks (C)</p> Signup and view all the answers

What is a digital certificate?

<p>A document that contains the public key, algorithm, and information about the key owner's identity (A)</p> Signup and view all the answers

What is the purpose of a fingerprint (thumbprint) in a digital certificate?

<p>To provide a hash of the certificate in hexadecimal format for easier manual checks (C)</p> Signup and view all the answers

Which of the following is a method for distributing public keys?

<p>All of the above (B)</p> Signup and view all the answers

What is the purpose of a Certification Authority Public Key Infrastructure?

<p>To create and issue digital certificates (C)</p> Signup and view all the answers

What are the levels of certificate validation?

<p>Domain Validation, Organisation Validation (OV), Extended Validation (EV) (C)</p> Signup and view all the answers

What are the components of an X.509 certificate?

<p>Version number, serial number, issuing CA name, validity period, public key, algorithm for the CA's signature, digital signature of the CA (D)</p> Signup and view all the answers

How do browsers verify the authenticity of a website's certificate?

<p>By checking the issuing CA and verifying its signature on the certificate using the CA's public key (D)</p> Signup and view all the answers

What is the purpose of a Certificate Revocation List (CRL)?

<p>To post revoked certificates on certificate servers (A)</p> Signup and view all the answers

What is the recommended way to store private keys for individuals?

<p>On a smartcard/USB token; optionally combined with a PIN/passphrase or biometric identification (B)</p> Signup and view all the answers

What is the purpose of a Hardware Security Module (HSM) or Trusted Platform Module (TPM)?

<p>To store private keys and perform cryptographic computations for organizations (C)</p> Signup and view all the answers

What is the purpose of a Registration Authority (RA) in a Certification Authority Public Key Infrastructure?

<p>To verify the identity of the public key owner (D)</p> Signup and view all the answers

What is the purpose of digital certificates?

<p>To provide a secure way of distributing and verifying public keys.</p> Signup and view all the answers

What is the risk of not properly managing public keys?

<p>Impersonation or man-in-the-middle attacks.</p> Signup and view all the answers

Why is revoking a public key important?

<p>To prevent the use of a compromised private key.</p> Signup and view all the answers

What is the purpose of an expiry date on a public key?

<p>To ensure that keys are regularly updated and not used indefinitely.</p> Signup and view all the answers

What information is included in a digital certificate?

<p>Public key, algorithm, key owner's identity, and digital signatures.</p> Signup and view all the answers

What is the purpose of a fingerprint (thumbprint) of a digital certificate?

<p>To provide an easily verifiable hash of the certificate.</p> Signup and view all the answers

What are the methods for distributing public keys?

<p>Manual distribution, website publication, certificate servers/directory servers.</p> Signup and view all the answers

What is a Certification Authority Public Key Infrastructure composed of?

<p>A Certification Authority (CA) and a Registration Authority (RA).</p> Signup and view all the answers

What is the process for creating a digital certificate?

<p>Creating a public-private key pair, submitting public key to a CA, RA verifies owner's identity, CA issues certificate digitally signed using private key.</p> Signup and view all the answers

What are the three levels of certificate validation?

<p>Domain Validation, Organisation Validation (OV), and Extended Validation (EV).</p> Signup and view all the answers

What components are included in an X.509 certificate?

<p>Version number, certificate serial number, issuing CA name, validity period, owner's information, public key and associated algorithm, algorithm for CA's signature, and digital signature of the CA.</p> Signup and view all the answers

What is the purpose of Certificate Revocation Lists (CRL)?

<p>To list revoked certificates that should no longer be trusted.</p> Signup and view all the answers

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