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Questions and Answers
What are the two related keys involved in public key cryptography?
What are the two related keys involved in public key cryptography?
- Public key and symmetric key
- Public key and private key (correct)
- Private key and asymmetric key
- Secret key and private key
What are public key certificates?
What are public key certificates?
- Digital documents issued by a Certification Authority that bind a subscriber's name to a symmetric key
- Digital documents issued by a Certification Authority that bind a subscriber's name to a secret key
- Digital documents issued by a Certification Authority that bind a subscriber's name to a public key (correct)
- Digital documents issued by a Certification Authority that bind a subscriber's name to an asymmetric key
What is Public Key Infrastructure (PKI) used for?
What is Public Key Infrastructure (PKI) used for?
- To administer certificates and symmetric key pairs
- To administer certificates and secret key pairs
- To administer certificates and public-private key pairs (correct)
- To administer certificates and asymmetric key pairs
What are some misconceptions about public-key encryption?
What are some misconceptions about public-key encryption?
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What difficulties does public-key cryptography address?
What difficulties does public-key cryptography address?
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How many ingredients does a public-key encryption scheme have?
How many ingredients does a public-key encryption scheme have?
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What can encryption with public key provide?
What can encryption with public key provide?
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Study Notes
- Public key cryptography involves two related keys, a public key and a private key.
- Public key certificates are digital documents issued by a Certification Authority that bind a subscriber's name to a public key.
- Public Key Infrastructure (PKI) is used to administer certificates and public-private key pairs.
- Misconceptions about public-key encryption include that it is more secure than symmetric encryption and that it has made symmetric encryption obsolete.
- Public-key cryptography addresses the difficulties of key distribution and verifying the sender of a message.
- A public-key encryption scheme has six ingredients: plaintext, encryption algorithm, public and private key, ciphertext, and decryption algorithm.
- Encryption with public key can provide confidentiality, integrity, and authenticity.
- Encryption with private key can provide authenticity but not confidentiality or integrity.
- Conventional encryption requires the same algorithm and key for encryption and decryption, while public-key encryption uses a pair of keys, one for encryption and one for decryption.
- Public-key cryptography can be used for confidentiality and authentication of messages.
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