cryptology ch9 rsa

Asymmetric encryption utilizes only a public key for encryption and decryption.

False

Asymmetric encryption can be used for confidentiality but not for authentication.

False

Asymmetric encryption transforms plaintext into ciphertext.

True

Plaintext is transformed into ciphertext using two keys and a decryption algorithm.

False

A major advance in symmetric cryptography occurred with the development of the rotor encryption/decryption machine.

True

Public-key encryption is more secure from cryptanalysis than symmetric encryption.

False

Much of the theory of public-key cryptosystems is based on number theory.

True

Asymmetric algorithms rely on one key for encryption and a different but related key for decryption.

True

The encryption algorithm performs various transformation on the ciphertext.

False

If the authenticator is encrypted with the sender's private key, it serves as a signature that verifies origin, content, and sequencing.

True

A trap-door one-way function is easy to calculate in one direction and infeasible to calculate in the other direction unless certain additional information is known.

True

A public-key encryption scheme is not vulnerable to a brute-force attack.

False

Before the application of the public-key cryptosystem each participant must generate a pair of keys.

True

The defense against the brute-force approach for RSA is to use a large key space.

True

Timing attacks are ciphertext attacks that are only applicable to RSA.

False

Asymmetric encryption is also known as __.

C) public-key encryption

Public-key encryption is also known as __.

B) asymmetric encryption

Asymmetric encryption can be used for __.

D) both confidentiality and authentication

Plaintext is recovered from the ciphertext using the paired key and a __.

C) decryption algorithm

The most widely used public-key cryptosystem is __.

B) RSA

Public-key algorithms are based on __.

B) mathematical functions

__ are two related keys, a public key and a private key that are used to perform complementary operations, such as encryption and decryption or signature generation and signature verification.

B) Asymmetric keys

The __ indicates that the subscriber identified in the certificate has sole control and access to the private key.

D) Public Key Certificate

A __ is a cryptographic algorithm that uses two related keys, a public key and a private key. The two keys have the property that deriving the private key from the public key is computationally infeasible.

C) Public Key (Asymmetric) Cryptographic Algorithm

A public-key encryption scheme has __ ingredients.

C) six

The key used in symmetric encryption is referred to as a __ key.

A) secret

The readable message or data that is fed into the algorithm as input is the __.

D) plaintext

Two issues to consider with the computation required to use RSA are encryption/decryption and __.

C) key generation

__ depend on the running time of the decryption algorithm.

D) Timing attacks

We define the __ of an algorithm to be f(n) if, for all n and all inputs of length n the execution of the algorithm takes at most f(n) steps. This is a common measure of the efficiency of an algorithm.

D) time complexity