computer security fundamentals
Exam with answers
We have symmetric and asymmetric (public key)
encryption. What can you say about the encryption and
decryption keys of symmetric encryption, Are they the
same? - CORRECT ANSWERS ✔✔same
We have symmetric and asymmetric (public key)
encryption. What can you say about the encryption and
decryption keys of asymmetric encryption, Are they the
same? - CORRECT ANSWERS ✔✔different
In the context of Cryptography the initials C, I, A are
used?
What does C stand for? - CORRECT ANSWERS
✔✔Confidentiality
In the context of Cryptography the initials C, I, A are
used?
What does A stand for? - CORRECT ANSWERS
✔✔Availability
,T/F Security attacks are distinguished as passive or
active. In a passive attack the adversary attempts to
learn information from the system. - CORRECT ANSWERS
✔✔true
T/F Security attacks are distinguished as passive or
active. In an active attack the adversary attempts to
affect (alter) system resources - CORRECT ANSWERS
✔✔true
The physical distance between co-channel cells is
roughly: (answer should be "x cell" or "x cells") -
CORRECT ANSWERS ✔✔2.5 cells
T/F The 5G high frequency bandwidth is in the millimeter-
wave frequency range (24.25 GHz and above). - CORRECT
ANSWERS ✔✔true
Heisenberg's duality principle says that there is a natural
tradeoff between knowing a particle's position and its
momentum (speed): the greater the uncertainty in it's
position, the smaller the uncertainty in its momentum.
Schroedinger found it absurd the possibility that particles
can have simultaneously different states and proposed a
thought experiment (paradox) in which "objects" could
have two different states at the same time (each with a
certain probability).
,What "object" did this experiment involve? (answer is one
word) - CORRECT ANSWERS ✔✔cat
In the Quantum Crypto experiment based on
Schroedinger's paradox Alice sends Bob four steel boxes.
Bob observes that none of the boxes have been opened
( tampered). Bob then opens the boxes and finds that all
the cats are alive with the first three being black and the
last white. What is the exchanged 4-bit string? - CORRECT
ANSWERS ✔✔1110
Following is an applications where authentication is
needed: list the item needed to implement it?Access to a
terminal (one word): -------------- - CORRECT ANSWERS
✔✔password
Following is an applications where authentication is
needed: list the items needed to implement it?Access to a
(recent) iPhone: ---------- , ------------ - CORRECT ANSWERS
✔✔password, facial recognition
Key, facial recognition
password, face
key, face
Following is an application where authentication is
needed: withdraw money from an ATM. List what is
, needed. - CORRECT ANSWERS ✔✔card, pin (personal
identification number)
How many keys are used in symmetric encryption? -
CORRECT ANSWERS ✔✔one
How many keys are used in asymmetric (public key)
encryption? - CORRECT ANSWERS ✔✔two
Two techniques are used for symmetric key encryption:
substitution and transposition.
a. Substitution is used to establish confusion.
b. Substitution is used to establish diffusion. - CORRECT
ANSWERS ✔✔a
Two techniques are used for symmetric key encryption:
substitution and transposition.
a. Transposition is used to establish diffusion.
b. Transposition is used to establish confusion. - CORRECT
ANSWERS ✔✔a
An example of a steganography technique is to take the
sequence of first letters of each word of a message. -
CORRECT ANSWERS ✔✔true
Exam with answers
We have symmetric and asymmetric (public key)
encryption. What can you say about the encryption and
decryption keys of symmetric encryption, Are they the
same? - CORRECT ANSWERS ✔✔same
We have symmetric and asymmetric (public key)
encryption. What can you say about the encryption and
decryption keys of asymmetric encryption, Are they the
same? - CORRECT ANSWERS ✔✔different
In the context of Cryptography the initials C, I, A are
used?
What does C stand for? - CORRECT ANSWERS
✔✔Confidentiality
In the context of Cryptography the initials C, I, A are
used?
What does A stand for? - CORRECT ANSWERS
✔✔Availability
,T/F Security attacks are distinguished as passive or
active. In a passive attack the adversary attempts to
learn information from the system. - CORRECT ANSWERS
✔✔true
T/F Security attacks are distinguished as passive or
active. In an active attack the adversary attempts to
affect (alter) system resources - CORRECT ANSWERS
✔✔true
The physical distance between co-channel cells is
roughly: (answer should be "x cell" or "x cells") -
CORRECT ANSWERS ✔✔2.5 cells
T/F The 5G high frequency bandwidth is in the millimeter-
wave frequency range (24.25 GHz and above). - CORRECT
ANSWERS ✔✔true
Heisenberg's duality principle says that there is a natural
tradeoff between knowing a particle's position and its
momentum (speed): the greater the uncertainty in it's
position, the smaller the uncertainty in its momentum.
Schroedinger found it absurd the possibility that particles
can have simultaneously different states and proposed a
thought experiment (paradox) in which "objects" could
have two different states at the same time (each with a
certain probability).
,What "object" did this experiment involve? (answer is one
word) - CORRECT ANSWERS ✔✔cat
In the Quantum Crypto experiment based on
Schroedinger's paradox Alice sends Bob four steel boxes.
Bob observes that none of the boxes have been opened
( tampered). Bob then opens the boxes and finds that all
the cats are alive with the first three being black and the
last white. What is the exchanged 4-bit string? - CORRECT
ANSWERS ✔✔1110
Following is an applications where authentication is
needed: list the item needed to implement it?Access to a
terminal (one word): -------------- - CORRECT ANSWERS
✔✔password
Following is an applications where authentication is
needed: list the items needed to implement it?Access to a
(recent) iPhone: ---------- , ------------ - CORRECT ANSWERS
✔✔password, facial recognition
Key, facial recognition
password, face
key, face
Following is an application where authentication is
needed: withdraw money from an ATM. List what is
, needed. - CORRECT ANSWERS ✔✔card, pin (personal
identification number)
How many keys are used in symmetric encryption? -
CORRECT ANSWERS ✔✔one
How many keys are used in asymmetric (public key)
encryption? - CORRECT ANSWERS ✔✔two
Two techniques are used for symmetric key encryption:
substitution and transposition.
a. Substitution is used to establish confusion.
b. Substitution is used to establish diffusion. - CORRECT
ANSWERS ✔✔a
Two techniques are used for symmetric key encryption:
substitution and transposition.
a. Transposition is used to establish diffusion.
b. Transposition is used to establish confusion. - CORRECT
ANSWERS ✔✔a
An example of a steganography technique is to take the
sequence of first letters of each word of a message. -
CORRECT ANSWERS ✔✔true
