Computer Security Fundamentals Midterm QUESTIONS WITH ANSWERS

Computer Security Fundamentals
Midterm QUESTIONS WITH ANSWERS


What does encryption do? - CORRECT ANSWERS
✔✔Obfuscates a message (plaintext)


In symmetric encryption, the keys are ______.
In asymmetric encryption, the keys are ______. - CORRECT
ANSWERS ✔✔the same.
different.


What do the initials 'CIA' stand for? - CORRECT ANSWERS
✔✔Confidentiality
Integrity
Availability


In a passive attack, the adversary attempts to: -
CORRECT ANSWERS ✔✔learn or make use of information
from the system without affecting system resources


In an active attack, the adversary attempts to: - CORRECT
ANSWERS ✔✔alter system resources or affect their
operation

, Using the Caesar cipher, what is the ciphertext with p =
"ATTACKNOW" and k='C'? - CORRECT ANSWERS
✔✔CVVCEMPQY


List three applications where authentication is needed
and how it is implemented - CORRECT ANSWERS ✔✔1.
Credit card, PIN
2. Car, keys
3. Yourself, SSN


How many keys are used in symmetric encryption? -
CORRECT ANSWERS ✔✔One


How many keys are used in asymmetric encryption? -
CORRECT ANSWERS ✔✔Two


The length of a key in a symmetric encryption scheme is
16 bits. Roughly how many tries are needed in a brute-
force attack to break this encryption scheme? - CORRECT
ANSWERS ✔✔2^16


How long should the length of a key for a symmetric
encryption scheme be? - CORRECT ANSWERS ✔✔At least
128 bits