Question 1

the term __________ refers to a digital signature scheme that involves only the communicating parties.

Accepted Answer

The answer of the term __________ refers to a digital...

Question 2

A _________ is an authentication mechanism that enables the creator of a message to attach a code that acts as a signature.

Accepted Answer

The answer of A _________ is an authentication mechanism that...

Question 3

With a __________ attack the attacker is allowed to use the user as an "oracle".this means that the user may request signatures of messages that depend on previously obtained message-signature pairs.
A)adaptive chosen message
B)generic chosen
C)directed chosen message
D)known message

Accepted Answer

An adaptive chosen message attack allows the attacker to request signatures for messages based on previously obtained message-signature pairs, effectively using the user as an "oracle" to gather more information and potentially compromise the system.

Question 4

to create a __________ a user calculates two quantities, r and s, that are functions of the public key components (p, q, g), the user's private key (x), the hash code of the message H(M), and an additional integer k that should be generated randomly or pseudorandomly and be unique for each signing.
A)signature
B)hash authentication
C)secret key
D)global key

Accepted Answer

The process described is for creating a digital signature. The calculation of two quantities, r and s, based on the public key components, the user's private key, the hash of the message, and a unique integer k, is characteristic of digital signature algorithms like DSA (Digital Signature Algorithm).

Question 5

As with ElGamal encryption, the global elements of __________ are a prime number q and a, which is a primitive root of q.
A)ElGamal digital signature
B)digital signature standard
C)digital signature
D)direct digital signature

Accepted Answer

ElGamal digital signature uses a prime number q and a primitive root a of q as global elements, similar to ElGamal encryption.

Question 6

the ____________ components of DSA are the same as in the Schnorr signature scheme.
A)private key
B)EDS
C)global public key
D)message digest

Accepted Answer

The answer of the ____________ components of DSA are the...

Question 7

the first stage in generating an RSA-PSS signature of a message
M is to generate from M a fixed-length message digest, called an ______________.

Accepted Answer

The answer of the first stage in generating an RSA-PSS...

Question 8

A __________ is where the attacker determines the user's private key.
A)universal forgery
B)selective forgery
C)existential forgery
D)total break

Accepted Answer

A total break occurs when the attacker is able to determine the user's private key, compromising the entire cryptographic system.

Question 9

In the digital signature algorithm the user's __________ is represented by x, which is a random or pseudorandom integer with 0 < x < q.
A)per message secret number
B)private key
C)global key
D)public key

Accepted Answer

The answer of In the digital signature algorithm the user's...

Question 10

A digital signature must have the following properties: it must verify the author and the date and time of the signature; it must authenticate the contents at the time of the signature; and it must ___________ to resolve disputes.

Accepted Answer

The answer of A digital signature must have the following...

Question 11

the __________ encryption scheme is designed to enable encryption by a user's public key with decryption by the user's private key.

Accepted Answer

The answer of the __________ encryption scheme is designed to...

Question 12

the _________________, which is the latest of the RSA schemes, is the one that RSA Laboratories recommends as the most secure of the RSA schemes.
A)RSA-PSS
B)ECDSA
C)DSA-SDS
D)EDSDS

Accepted Answer

RSA-PSS (RSA Probabilistic Signature Scheme) is recommended by RSA Laboratories as the most secure of the RSA schemes, especially for digital signatures.

Question 13

In the __________ approach only the sender knows the private key so only the sender could have produced a valid signature.
A)EDS
B)DSA
C)DSS
D)RSA

Accepted Answer

In the RSA approach, the sender uses their private key to create a digital signature, ensuring that only the sender could have produced a valid signature.

Question 14

the attacker finds an efficient signing algorithm that provides an equivalent way of constructing signatures on arbitrary messages is a ___________ .

Accepted Answer

The answer of the attacker finds an efficient signing algorithm...

Question 15

the __________ attack is where the attacker chooses a list of messages before attempting to break the user's signature scheme, independent of the user's public key.the attacker then obtains from the user valid signatures for the chosen messages.

Accepted Answer

The answer of the __________ attack is where the attacker...

Question 16

the DSS makes use of the Secure Hash Algorithm and presents a new digital signature technique known as the ______________ .

Accepted Answer

The answer of the DSS makes use of the Secure...

Question 17

_________ specifies that if the signature generation process results in a value of s = 0 a new value of k should be generated and the signature should be recalculated.

Accepted Answer

The answer of _________ specifies that if the signature generation...

Question 18

the digital signature approach uses an algorithm that is designed to provide only the _________ function.
A)digital signature
B)ElGamal
C)DSA
D)timestamp

Accepted Answer

The digital signature approach is specifically designed to provide the digital signature function, which ensures the authenticity and integrity of a message or document.

Question 19

the __________ scheme minimizes the message dependent amount of computation required to generate a signature.

Accepted Answer

The answer of the __________ scheme minimizes the message dependent...

Question 20

the __________ scheme minimizes the message dependent amount of computation required to generate a signature.
A)Rabin
B)SHA-1
C)ElGamal
D)Schnorr

Accepted Answer

The Schnorr signature scheme is known for minimizing the message-dependent amount of computation required to generate a signature, making it efficient and fast compared to other signature schemes.

Quiz 13: Digital Signatures

the term __________ refers to a digital signature scheme that involves only the communicating parties.

A _________ is an authentication mechanism that enables the creator of a message to attach a code that acts as a signature.

With a __________ attack the attacker is allowed to use the user as an "oracle".this means that the user may request signatures of messages that depend on previously obtained message-signature pairs.

As with ElGamal encryption, the global elements of __________ are a prime number q and a, which is a primitive root of q.

the ____________ components of DSA are the same as in the Schnorr signature scheme.

the first stage in generating an RSA-PSS signature of a message M is to generate from M a fixed-length message digest, called an ______________.

A __________ is where the attacker determines the user's private key.

In the digital signature algorithm the user's __________ is represented by x, which is a random or pseudorandom integer with 0 < x < q.

A digital signature must have the following properties: it must verify the author and the date and time of the signature; it must authenticate the contents at the time of the signature; and it must ___________ to resolve disputes.

the __________ encryption scheme is designed to enable encryption by a user's public key with decryption by the user's private key.

the _________________, which is the latest of the RSA schemes, is the one that RSA Laboratories recommends as the most secure of the RSA schemes.

In the __________ approach only the sender knows the private key so only the sender could have produced a valid signature.

the attacker finds an efficient signing algorithm that provides an equivalent way of constructing signatures on arbitrary messages is a ___________ .

the __________ attack is where the attacker chooses a list of messages before attempting to break the user's signature scheme, independent of the user's public key.the attacker then obtains from the user valid signatures for the chosen messages.

the DSS makes use of the Secure Hash Algorithm and presents a new digital signature technique known as the ______________ .

_________ specifies that if the signature generation process results in a value of s = 0 a new value of k should be generated and the signature should be recalculated.

the digital signature approach uses an algorithm that is designed to provide only the _________ function.

the __________ scheme minimizes the message dependent amount of computation required to generate a signature.

the __________ scheme minimizes the message dependent amount of computation required to generate a signature.