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ICT2213 Applied Cryptography Lecture 11: Key Management Quiz

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Questions and Answers

What is the main purpose of public-key cryptography in the context of key distribution?

To verify the integrity of the message during transmission
To authenticate the identity of the sender and receiver
To distribute secret keys between the sender and receiver (correct)
To encrypt the message before sending it over a secure channel

What is the primary function of a Certification Authority (CA) in a public-key infrastructure (PKI)?

To verify the identity of users and issue digital certificates (correct)
To generate and distribute public and private keys
To provide encryption and decryption services for users
To maintain a centralized database of all public keys

What is the purpose of the certificate chain in a PKI?

To allow users to verify the authenticity of a public key (correct)
To enable the revocation of certificates in the hierarchy
To ensure that the root CA's public key is known to all users
To provide a secure way to distribute public keys

How does the Web-of-Trust model for public key certification differ from the PKI model?

The Web-of-Trust relies on users to directly certify the trustworthiness of public keys (D) Signup and view all the answers

What is the main drawback of the PKI model for public key certification?

The need for users to manually verify the certificate chain (A) Signup and view all the answers

What is the purpose of the root CA's public key in a PKI?

To verify the signatures of subordinate CAs (D) Signup and view all the answers

What organizations can set up CAs as mentioned in the text?

Any profit-making or non-profit organizations (C) Signup and view all the answers

How do applications like web browsers typically handle root CA certificates?

Hardcode a list of root CA certificates considered trusted (A) Signup and view all the answers

What is the method used for a root CA to certify itself?

Self-signed certificate (D) Signup and view all the answers

Why is it challenging to trust CAs based on the information provided?

Root CAs certify themselves (B) Signup and view all the answers

What is the common approach for applications like web browsers when it comes to trusting root CAs?

Hardcoding a predefined list of trusted CAs (B) Signup and view all the answers

What is the primary drawback of the Public Key Infrastructure (PKI) system mentioned in the text?

Users are unaware of the risks associated with PKI, allowing phishing websites to exploit this ignorance. (D) Signup and view all the answers

What is the fundamental principle behind the Web-of-Trust concept?

Anyone can certify a public key by signing it with their own private key. (A) Signup and view all the answers

What is the primary drawback of the Web-of-Trust model mentioned in the text?

Careless or malicious users can impact the security of the system. (A) Signup and view all the answers

What is the primary purpose of PGP (Pretty Good Privacy) key servers mentioned in the text?

To facilitate the distribution of PGP public keys without offering any trust. (A) Signup and view all the answers

What is the principle behind the Key Continuity Management approach mentioned in the text?

Trust public keys that have been in use for a long time, even if they are not certified. (C) Signup and view all the answers

In the context of the SSH login example provided, what is the appropriate action when presented with a new public key?

Verify the new public key through an out-of-band channel before proceeding. (D) Signup and view all the answers

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