Hybrid Cryptosystems

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

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

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

Who implemented the RSA encryption algorithm?

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

What is the security of RSA encryption connected to?

Which encryption technique is NOT mentioned in the text?

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

What is the key requirement in a public key system?

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

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

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?

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

What is a potential security vulnerability in using asymmetric keys?

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

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

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

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

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

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

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

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.

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

The RSA encryption algorithm was implemented by Clifford Cocks.

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

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

Public key algorithms are faster than symmetric encryption.

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

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.

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

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

Digital signature schemes can be used for sender authentication.

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

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

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

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

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

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?