Question 1

Public-key algorithms are based on __________ .
A)permutation
B)mathematical functions
C)substitution
D)symmetry

Accepted Answer

Public-key algorithms are based on mathematical functions that are computationally feasible to perform in one direction (e.g., encryption) but infeasible to reverse without a specific piece of information (e.g., the private key), making them suitable for tasks like encryption and digital signatures.

Question 2

A __________ is one that maps a domain into a range such that every function value has a unique inverse, with the condition that the calculation of the function is easy, whereas the calculation of the inverse is infeasible.

Accepted Answer

The answer of A __________ is one that maps a...

Question 3

the __________ is a set of policies, processes, server platforms, software and workstations used for the purpose of administering certificates and public-private key pairs, including the ability to issue, maintain, and revoke public key certificates.

Accepted Answer

The answer of the __________ is a set of policies,...

Question 4

"the sender 'signs' a message with its private key.Signing is
achieved by a cryptographic algorithm applied to the message
or to a small block of data that is a function of the message," is
a description of a ___________ .

Accepted Answer

The answer of "the sender 'signs' a message with its...

Question 5

Asymmetric encryption transforms plaintext into __________ using one of two keys and an encryption algorithm.

Accepted Answer

The answer of Asymmetric encryption transforms plaintext into __________ using...

Question 6

the scrambled message produced as output is the __________ .It depends on the plaintext and the key.

Accepted Answer

The answer of the scrambled message produced as output is...

Question 7

A __________ is a digital document issued and digitally signed by the private key of a Certification Authority that binds the name of a subscriber to a public key.

Accepted Answer

The answer of A __________ is a digital document issued...

Question 8

two issues to consider with the computation required to use RSA are encryption/decryption and __________ .
A)time complexity
B)trap-door one-way functions
C)key generation
D)asymmetric encryption padding

Accepted Answer

Key generation is a critical issue in RSA as it involves generating large prime numbers and ensuring the security of the keys, which is computationally intensive.

Question 9

the readable message or data that is fed into the algorithm as input is the ____________ .
A)ciphertext
B)exchange
C)plaintext
D)encryption

Accepted Answer

Plaintext is the term used for the original, readable message or data that is input into an encryption algorithm before encryption.

Question 10

A __________ is when two sides cooperate to exchange a session key.

Accepted Answer

The answer of A __________ is when two sides cooperate...

Question 11

the key used in symmetric encryption is referred to as a __________ key.
A)public
B)secret
C)private
D)decryption

Accepted Answer

In symmetric encryption, the same key is used for both encryption and decryption, and it is referred to as a secret key.

Question 12

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.
A)Private Key (Symmetric) Cryptographic Algorithm
B)Key Exchange Cryptographic Algorithm
C)Public Key (Asymmetric) Cryptographic Algorithm
D)RSA Digital Cryptographic Algorithm

Accepted Answer

The correct answer is C) Public Key (Asymmetric) Cryptographic Algorithm. This type of cryptographic algorithm uses a pair of keys—a public key and a private key—for secure communication. The public key can be shared with anyone, while the private key is kept secret. It is computationally infeasible to derive the private key from the public key, which is a fundamental property of asymmetric cryptography.

Question 13

Public-key cryptography is asymmetric, involving the use of two separate keys, in contrast to ___________ encryption, which uses only one key.

Accepted Answer

The answer of Public-key cryptography is asymmetric, involving the use...

Question 14

__________ encryption is a form of cryptosystem in which encryption and decryption are performed using a public key and a private key.

Accepted Answer

The answer of __________ encryption is a form of cryptosystem...

Question 15

__________ 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.
A)Asymmetric keys
B)Key exchanges
C)Symmetric keys
D)Cipher keys

Accepted Answer

Asymmetric keys consist of a public key and a private key that are used together for encryption and decryption or for creating and verifying digital signatures. This is in contrast to symmetric keys, where the same key is used for both encryption and decryption.

Question 16

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.
A)time complexity
B)one-way function
C)timing attack
D)OAEP

Accepted Answer

Time complexity is the term used to define the number of steps an algorithm takes in terms of the input size (n), making it a measure of the efficiency of the algorithm.

Question 17

__________ depend on the running time of the decryption algorithm.
A)Mathematical attacks
B)timing attacks
C)Chosen ciphertext attacks
D)Brute-force attacks

Accepted Answer

Timing attacks exploit the time variation in the decryption process to gain information about the secret key.

Question 18

the difficulty of attacking __________ is based on the difficulty of finding the prime factors of a composite number.

Accepted Answer

The answer of the difficulty of attacking __________ is based...

Question 19

A public-key encryption scheme has __________ ingredients.
A)six
B)four
C)eight
D)two

Accepted Answer

A public-key encryption scheme typically involves six ingredients: plaintext, encryption algorithm, public and private keys, ciphertext, and decryption algorithm.

Question 20

the __________ indicates that the subscriber identified in the certificate has sole control and access to the private key.
A)OAEP
B)Public Key Certificate
C)Digital Signature
D)PKI

Accepted Answer

The Public Key Certificate indicates that the subscriber identified in the certificate has sole control and access to the private key. It serves as a verification that the public key contained within the certificate belongs to the person, organization, server, or device it claims to be associated with.

Quiz 9: Public-Key Cryptography and Rsa

Public-key algorithms are based on __________ .

A __________ is one that maps a domain into a range such that every function value has a unique inverse, with the condition that the calculation of the function is easy, whereas the calculation of the inverse is infeasible.

the __________ is a set of policies, processes, server platforms, software and workstations used for the purpose of administering certificates and public-private key pairs, including the ability to issue, maintain, and revoke public key certificates.

"the sender 'signs' a message with its private key.Signing is achieved by a cryptographic algorithm applied to the message or to a small block of data that is a function of the message," is a description of a ___________ .

Asymmetric encryption transforms plaintext into __________ using one of two keys and an encryption algorithm.

the scrambled message produced as output is the __________ .It depends on the plaintext and the key.

A __________ is a digital document issued and digitally signed by the private key of a Certification Authority that binds the name of a subscriber to a public key.

two issues to consider with the computation required to use RSA are encryption/decryption and __________ .

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

A __________ is when two sides cooperate to exchange a session key.

the key used in symmetric encryption is referred to as a __________ key.

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.

Public-key cryptography is asymmetric, involving the use of two separate keys, in contrast to ___________ encryption, which uses only one key.

__________ encryption is a form of cryptosystem in which encryption and decryption are performed using a public key and a private key.

__________ 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.

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.

__________ depend on the running time of the decryption algorithm.

the difficulty of attacking __________ is based on the difficulty of finding the prime factors of a composite number.

A public-key encryption scheme has __________ ingredients.

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