Hybrid Cryptosystems
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Hybrid Cryptosystems

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Questions and Answers

Which type of cryptography uses pairs of related keys consisting of a public key and a corresponding private key?

  • Symmetric cryptography
  • Asymmetric cryptography
  • Hash cryptography
  • Public-key cryptography (correct)

    • In a public-key encryption system, who can encrypt a message?

  • Only the recipient of the message
  • Only the person with the private key
  • The person who generated the key pair
  • Anyone with the public key (correct)

    • What does public-key encryption on its own not conceal?

  • The content of a message
  • The recipient of a message
  • The metadata of a message (correct)
  • The source of a message

    • Who implemented the RSA encryption algorithm?

    <p>Clifford Cocks</p> Signup and view all the answers

    What is the name of the key exchange method published by Diffie and Hellman?

    <p>Diffie-Hellman key exchange</p> Signup and view all the answers

    What is the security of RSA encryption connected to?

    <p>Prime factorization</p> Signup and view all the answers

    Which encryption technique is NOT mentioned in the text?

    <p>Diffie-Hellman key exchange</p> Signup and view all the answers

    Which type of encryption is slower than good symmetric encryption and is often used in combination with symmetric encryption in modern cryptosystems?

    <p>Asymmetric encryption</p> Signup and view all the answers

    What is the key requirement in a public key system?

    <p>The public keys can be disseminated widely and openly</p> Signup and view all the answers

    Which approach to authenticating public keys uses one or more third parties known as certificate authorities to certify ownership of key pairs?

    <p>Public key infrastructure (PKI)</p> Signup and view all the answers

    What is the main purpose of a digital signature in public key cryptography?

    <p>To ensure non-repudiation</p> Signup and view all the answers

    Which type of cryptosystem uses a public/private asymmetric key-exchange algorithm to encrypt and exchange a symmetric key, which is then used by symmetric-key cryptography to transmit data?

    <p>Hybrid cryptosystem</p> Signup and view all the answers

    What is the chief security risk in using asymmetric key algorithms?

    <p>Private key becoming known</p> Signup and view all the answers

    What is a potential security vulnerability in using asymmetric keys?

    <p>Alteration of public keys</p> Signup and view all the answers

    In a man-in-the-middle attack, what does the attacker do with intercepted encrypted messages and responses?

    <p>Decrypt and re-encrypt using the correct public keys</p> Signup and view all the answers

    Which of the following is a potential weakness of a public key infrastructure (PKI)?

    <p>The certificate authority must be trusted by all participating parties</p> Signup and view all the answers

    What is a man-in-the-middle attack?

    <p>An attack where an attacker intercepts and alters communications between two parties without their knowledge</p> Signup and view all the answers

    What is a potential consequence of an insecure subordinate certificate in a PKI?

    <p>A potential man-in-the-middle attack</p> Signup and view all the answers

    What is a key feature of the RSA Algorithm for public key cryptography?

    <p>The anticipation of the factorization problem used to create a trapdoor function</p> Signup and view all the answers

    True or false: Public-key cryptography relies on pairs of related keys, consisting of a public key and a corresponding private key.

    <p>True</p> Signup and view all the answers

    True or false: The security of public-key cryptography depends on keeping the private key secret, while the public key can be openly distributed.

    <p>True</p> Signup and view all the answers

    True or false: In a public-key encryption system, anyone with a public key can encrypt a message, but only those who know the corresponding private key can decrypt the ciphertext.

    <p>True</p> Signup and view all the answers

    Diffie-Hellman key exchange was developed by Malcolm J. Williamson.

    <p>False</p> Signup and view all the answers

    The RSA encryption algorithm was implemented by Clifford Cocks.

    <p>False</p> Signup and view all the answers

    Whitfield Diffie and Martin Hellman published the first practical method for establishing a shared secret-key over an authenticated communications channel.

    <p>True</p> Signup and view all the answers

    The RSA algorithm uses exponentiation modulo a product of two very large primes.

    <p>True</p> Signup and view all the answers

    Public key algorithms are faster than symmetric encryption.

    <p>False</p> Signup and view all the answers

    Public key systems require a separate key for each possible pair of users.

    <p>False</p> Signup and view all the answers

    True or false: Hybrid cryptosystems use a public/private asymmetric key-exchange algorithm to encrypt and exchange a symmetric key, which is then used for symmetric-key cryptography to transmit data.

    <p>True</p> Signup and view all the answers

    A "web of trust" is a decentralized approach to authenticating public keys.

    <p>True</p> Signup and view all the answers

    True or false: The private key of a pair becoming known is the chief security risk in using asymmetric key algorithms.

    <p>True</p> Signup and view all the answers

    Digital signature schemes can be used for sender authentication.

    <p>True</p> Signup and view all the answers

    True or false: Public key schemes are susceptible to a 'brute-force key search attack'.

    <p>True</p> Signup and view all the answers

    True or false: A man-in-the-middle attack is a potential security vulnerability in using asymmetric keys.

    <p>True</p> Signup and view all the answers

    True or false: Asymmetric man-in-the-middle attacks can only occur when one user's data is compromised?

    <p>False</p> Signup and view all the answers

    True or false: Man-in-the-middle attacks can be fully preventable when the communications infrastructure is physically controlled by one or both parties?

    <p>True</p> Signup and view all the answers

    True or false: A potential weakness of a public key infrastructure (PKI) is that the certificate authority must be trusted by all participating parties?

    <p>True</p> Signup and view all the answers

    True or false: An attacker who penetrates a certificate authority's servers and obtains its store of certificates and keys would not be able to mount a man-in-the-middle attack?

    <p>False</p> Signup and view all the answers

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