WGU C839 INTRO TO CRYPTOGRAPHY EXAM 2024
ACTUAL EXAM AND PRE ASSESSMENT EXAM
COMPLETE 500 QUESTIONS WITH DETAILED VERIFIED
ANSWERS (100% CORRECT ANSWERS) /ALREADY
GRADED A+
Virtually all cryptographic hash functions involve the iterative use of a compression
function. - ANSWER: True
A good hash function has the property that "the results of applying the function to a
large set of inputs will produce outputs that are evenly distributed and apparently
random". - ANSWER: True
Hash functions can be used for intrusion and virus detections. - ANSWER: True
The way to measure the resistance of a hash algorithm to cryptanalysis is to compare
its strength to the effort required for a brute-force attack. - ANSWER: True
It can be shown that some form of birthday attack will succeed against any hash
scheme involving the use of cipher block chaining without a secret key, provided that
either the resulting hash code is small enough or that a larger hash code can be
decomposed into independent subcodes. - ANSWER: True
The principal purpose of a hash function is __________ . - ANSWER: data integrity
__________ are measures of the number of potential collisions for a given hash
value. - ANSWER: Preimages
The effort required for a collision resistant attack is explained by a mathematical
result referred to as the ___________ . - ANSWER: birthday paradox
SHA-1 produces a hash value of __________ bits. - ANSWER: 160
The __________ resistance guarantees that it is impossible to find an alternative
message with the same hash value as a given message. - ANSWER: second pre-image
Requirements for a cryptographic hash function include ___________ which is the
one-way property. - ANSWER: pre-image resistance
A hash function that satisfies the properties of variable input size, fixed output size,
efficiency, preimage resistant, second preimage resistant and collision resistance is
referred to as a strong hash function. - ANSWER: True
A message authentication code is also known as a __________ hash function. -
ANSWER: keyed
, What does authentication do? - ANSWER: Associates an individual with an identity
The following are fundamental strategies for authenticating people on computer
systems, except: - ANSWER: something you make
An authentication system that requires the user to provide two different passwords
and a fingerprint scan is an example of: - ANSWER: two-factor authentication
We need to create a three-factor authentication system. The system already requires
the user's fingerprint and memorized password. Which of the following can we add
to implement three separate factors? - ANSWER: A procedure that requires the
user's cell phone
We need to create a three-factor authentication system. The system already uses a
USB device that is unlocked with the user's fingerprint. Which of the following can
we add to implement three separate factors? - ANSWER: A PIN entered via a built-in
PIN pad.
Two factor authentication is using two passwords. - ANSWER: False
Your fingerprint is a "something you have" factor. - ANSWER: False
An attack that blocks access to a system by other users is called: - ANSWER: Denial of
service
Keystroke loggers can be hardware or software based. - ANSWER: True
Offline attacks are easily detected. - ANSWER: False
In a password system, the total number of possible passwords is called the: -
ANSWER: Search space
In a password system, increasing the work factor results in which of the following?
Select all that apply. - ANSWER: Increases the length of the password
Increases the size of the character set from which users choose passwords
Dictionary attacks differ from trial and error attacks because dictionary attacks focus
on likely passwords. - ANSWER: True
Average attack space measures the time until success is certain. - ANSWER: False
When you are biased in selecting a password, you choose your password from the
entire search space. - ANSWER: False
ACTUAL EXAM AND PRE ASSESSMENT EXAM
COMPLETE 500 QUESTIONS WITH DETAILED VERIFIED
ANSWERS (100% CORRECT ANSWERS) /ALREADY
GRADED A+
Virtually all cryptographic hash functions involve the iterative use of a compression
function. - ANSWER: True
A good hash function has the property that "the results of applying the function to a
large set of inputs will produce outputs that are evenly distributed and apparently
random". - ANSWER: True
Hash functions can be used for intrusion and virus detections. - ANSWER: True
The way to measure the resistance of a hash algorithm to cryptanalysis is to compare
its strength to the effort required for a brute-force attack. - ANSWER: True
It can be shown that some form of birthday attack will succeed against any hash
scheme involving the use of cipher block chaining without a secret key, provided that
either the resulting hash code is small enough or that a larger hash code can be
decomposed into independent subcodes. - ANSWER: True
The principal purpose of a hash function is __________ . - ANSWER: data integrity
__________ are measures of the number of potential collisions for a given hash
value. - ANSWER: Preimages
The effort required for a collision resistant attack is explained by a mathematical
result referred to as the ___________ . - ANSWER: birthday paradox
SHA-1 produces a hash value of __________ bits. - ANSWER: 160
The __________ resistance guarantees that it is impossible to find an alternative
message with the same hash value as a given message. - ANSWER: second pre-image
Requirements for a cryptographic hash function include ___________ which is the
one-way property. - ANSWER: pre-image resistance
A hash function that satisfies the properties of variable input size, fixed output size,
efficiency, preimage resistant, second preimage resistant and collision resistance is
referred to as a strong hash function. - ANSWER: True
A message authentication code is also known as a __________ hash function. -
ANSWER: keyed
, What does authentication do? - ANSWER: Associates an individual with an identity
The following are fundamental strategies for authenticating people on computer
systems, except: - ANSWER: something you make
An authentication system that requires the user to provide two different passwords
and a fingerprint scan is an example of: - ANSWER: two-factor authentication
We need to create a three-factor authentication system. The system already requires
the user's fingerprint and memorized password. Which of the following can we add
to implement three separate factors? - ANSWER: A procedure that requires the
user's cell phone
We need to create a three-factor authentication system. The system already uses a
USB device that is unlocked with the user's fingerprint. Which of the following can
we add to implement three separate factors? - ANSWER: A PIN entered via a built-in
PIN pad.
Two factor authentication is using two passwords. - ANSWER: False
Your fingerprint is a "something you have" factor. - ANSWER: False
An attack that blocks access to a system by other users is called: - ANSWER: Denial of
service
Keystroke loggers can be hardware or software based. - ANSWER: True
Offline attacks are easily detected. - ANSWER: False
In a password system, the total number of possible passwords is called the: -
ANSWER: Search space
In a password system, increasing the work factor results in which of the following?
Select all that apply. - ANSWER: Increases the length of the password
Increases the size of the character set from which users choose passwords
Dictionary attacks differ from trial and error attacks because dictionary attacks focus
on likely passwords. - ANSWER: True
Average attack space measures the time until success is certain. - ANSWER: False
When you are biased in selecting a password, you choose your password from the
entire search space. - ANSWER: False
