CS4451 Module 3 Exam Latest Update
Adelli sends an image file containing a secret message to her sister as an
attachment. Adelli gives her sister instructions over the phone on how to
read the message. The sister follows the instructions and reads the
message. Which of the following techniques did Adelli use? - ANSWER
Steganography
Alpha and Beta are having a conversation in English. Gamma, who is a
gifted conversationalist and tends to monopolize conversations,
approaches Alpha and Beta. As soon as Alpha and Beta see Gamma, they
start speaking in Spanish, but Gamma does not understand. What did
Alpha and Beta just do? - ANSWER They employed a form of encryption.
A fifth-grade teacher shows the class a message encrypted using ROT13.
After explaining how it works, the teacher challenges them to decrypt the
message, which they easily accomplish. The teacher then repeats the
process with the XOR cipher. Which of the following statements is true?
Select two. - ANSWER Both methods use substitution.
XOR requires some type of key.
Johnny develops an app to encrypt short messages. He runs the
encryption program, but it is designed to deliberately introduce a 5- to 15-
second delay before encryption begins. What type of data is Johnny about
to encrypt? - ANSWER Plaintext
Which of the following statements best describes the critical factor that
allows cryptographic algorithms to be effective? - ANSWER The key(s)
used by algorithms must be securely guarded.
, Which of the following statements best describes the benefits of
cryptography? Select two. - ANSWER It is a hardening technique
It is a mitigation technique.
Daichi works on a project team that is designing a storage system with
immutable archiving capabilities. Once data is archived, it uses
cryptography to verify the data has not been changed. Which security
protection is the system designed to enforce? - ANSWER
An employee tries to mask his identity by programmatically changing the
From field to "a-nony-mouse" in an email. He uses periodic intervals to
send the email to the entire company promoting a product he is selling
online. An investigation reveals who sent the message. What capability of
cryptography was used to confirm the sender's identity? - ANSWER
Nonrepudiation
A group of scientists are trying to vigorously protect a major discovery that
will potentially lead to a series of breakthrough products. They all sign a
special nondisclosure agreement and commit to not revealing the
information to others outside of the department. What approach have the
scientists agreed to employ? - ANSWER Security through obscurity
Which of the following statements correctly describes the differences or
similarities between a stream cipher and a block cipher? Select two. -
ANSWER Stream ciphers are less secure.
Block ciphers reset after each iteration.
Kalaki subscribes to an online computer digest. Kalaki notices a string of
characters with a message next to a link that reads "... use to verify file
integrity after downloading." What does the string of characters represent?
Select four. - ANSWER A hash
A message digest
A digital fingerprint
The result of a one-way algorithm
Bodhi is leading a team responsible for writing the specifications of a new
hashing algorithm. What factor does the team need to keep in mind to
ensure it is secure? Select three. - ANSWER Every unique input should
render unique output.
Adelli sends an image file containing a secret message to her sister as an
attachment. Adelli gives her sister instructions over the phone on how to
read the message. The sister follows the instructions and reads the
message. Which of the following techniques did Adelli use? - ANSWER
Steganography
Alpha and Beta are having a conversation in English. Gamma, who is a
gifted conversationalist and tends to monopolize conversations,
approaches Alpha and Beta. As soon as Alpha and Beta see Gamma, they
start speaking in Spanish, but Gamma does not understand. What did
Alpha and Beta just do? - ANSWER They employed a form of encryption.
A fifth-grade teacher shows the class a message encrypted using ROT13.
After explaining how it works, the teacher challenges them to decrypt the
message, which they easily accomplish. The teacher then repeats the
process with the XOR cipher. Which of the following statements is true?
Select two. - ANSWER Both methods use substitution.
XOR requires some type of key.
Johnny develops an app to encrypt short messages. He runs the
encryption program, but it is designed to deliberately introduce a 5- to 15-
second delay before encryption begins. What type of data is Johnny about
to encrypt? - ANSWER Plaintext
Which of the following statements best describes the critical factor that
allows cryptographic algorithms to be effective? - ANSWER The key(s)
used by algorithms must be securely guarded.
, Which of the following statements best describes the benefits of
cryptography? Select two. - ANSWER It is a hardening technique
It is a mitigation technique.
Daichi works on a project team that is designing a storage system with
immutable archiving capabilities. Once data is archived, it uses
cryptography to verify the data has not been changed. Which security
protection is the system designed to enforce? - ANSWER
An employee tries to mask his identity by programmatically changing the
From field to "a-nony-mouse" in an email. He uses periodic intervals to
send the email to the entire company promoting a product he is selling
online. An investigation reveals who sent the message. What capability of
cryptography was used to confirm the sender's identity? - ANSWER
Nonrepudiation
A group of scientists are trying to vigorously protect a major discovery that
will potentially lead to a series of breakthrough products. They all sign a
special nondisclosure agreement and commit to not revealing the
information to others outside of the department. What approach have the
scientists agreed to employ? - ANSWER Security through obscurity
Which of the following statements correctly describes the differences or
similarities between a stream cipher and a block cipher? Select two. -
ANSWER Stream ciphers are less secure.
Block ciphers reset after each iteration.
Kalaki subscribes to an online computer digest. Kalaki notices a string of
characters with a message next to a link that reads "... use to verify file
integrity after downloading." What does the string of characters represent?
Select four. - ANSWER A hash
A message digest
A digital fingerprint
The result of a one-way algorithm
Bodhi is leading a team responsible for writing the specifications of a new
hashing algorithm. What factor does the team need to keep in mind to
ensure it is secure? Select three. - ANSWER Every unique input should
render unique output.
