ITN 262 COMBINED EXAM QUESTIONS
WITH CORRECT ANSWERS.
Alice is using volume encryption on her laptop. Which of the following attacks are blocked
by volume encryption, instead of other techniques, like file encryption or access controls?
Select all that apply.
a) Alice forgets to explicitly encrypt a sensitive file.
b) Someone steals Alice's laptop.
Alice is using file encryption on her laptop. Which of the following attacks are blocked by
file encryption, instead of other techniques, like volume encryption or access controls?
b) Someone steals Alice's laptop.
c) Kevin gives Alice a program with a Trojan horse that steals sensitive files from her and emails
them to him.
When encrypting data with a block cipher, each repetition is called a:
a) round.
The following are all best practices or proper recommendations for choosing an encryption
algorithm, except:
b) use DES if at all possible.
What is the block size of DES
64
What is the key size of DES
56
Is DES a us standard key?
Originally, but now no
Block size of AES
, 128
Key sizes of AES
128, 192, 256
A block cipher algorithm operates more slowly if we change the key every time we use it.
Which of the following concepts is most responsible for this delay?
a) Key expansion
Bob needs to deploy an efficient block cipher. He has a choice between 128-bit AES and
Triple DES using three different keys. Which of the following statements is most accurate
about these choices?
a) AES is more efficient than triple DES and it provides better security.
True or False? S-boxes are special data structures that control substitutions in block
ciphers.
True
Which of the following qualities of a good encryption algorithm apply to DES today? Select
all that apply.
c) Available for analysis
a) Explicitly designed for encryption
b) Security does not rely on its secrecy
d) Subjected to analysis
Which of the following qualities of a good encryption algorithm apply to AES today? Select
all that apply.
d) Subjected to analysis
c) Available for analysis
e) No practical weaknesses
a) Explicitly designed for encryption
b) Security does not rely on its secrecy
WITH CORRECT ANSWERS.
Alice is using volume encryption on her laptop. Which of the following attacks are blocked
by volume encryption, instead of other techniques, like file encryption or access controls?
Select all that apply.
a) Alice forgets to explicitly encrypt a sensitive file.
b) Someone steals Alice's laptop.
Alice is using file encryption on her laptop. Which of the following attacks are blocked by
file encryption, instead of other techniques, like volume encryption or access controls?
b) Someone steals Alice's laptop.
c) Kevin gives Alice a program with a Trojan horse that steals sensitive files from her and emails
them to him.
When encrypting data with a block cipher, each repetition is called a:
a) round.
The following are all best practices or proper recommendations for choosing an encryption
algorithm, except:
b) use DES if at all possible.
What is the block size of DES
64
What is the key size of DES
56
Is DES a us standard key?
Originally, but now no
Block size of AES
, 128
Key sizes of AES
128, 192, 256
A block cipher algorithm operates more slowly if we change the key every time we use it.
Which of the following concepts is most responsible for this delay?
a) Key expansion
Bob needs to deploy an efficient block cipher. He has a choice between 128-bit AES and
Triple DES using three different keys. Which of the following statements is most accurate
about these choices?
a) AES is more efficient than triple DES and it provides better security.
True or False? S-boxes are special data structures that control substitutions in block
ciphers.
True
Which of the following qualities of a good encryption algorithm apply to DES today? Select
all that apply.
c) Available for analysis
a) Explicitly designed for encryption
b) Security does not rely on its secrecy
d) Subjected to analysis
Which of the following qualities of a good encryption algorithm apply to AES today? Select
all that apply.
d) Subjected to analysis
c) Available for analysis
e) No practical weaknesses
a) Explicitly designed for encryption
b) Security does not rely on its secrecy
