cis3.2 homework #5
sklar/fall-2005
The homework is due by 8AM on WEDNESDAY DEC 21.
You can either email it to me or bring a hardcopy to the final exam.
This homework is worth 5 points in total.
The distribution of points is indicated below.
The homework is a WRITTEN ASSIGNMENT (i.e., no programming)
covering internet security topics from the last two lectures.
Refer to the notes from Tuesday Nov 29 and Tuesday Dec 6.
HINT: completing this assignment will prove very helpful
in studying for the final exam!
Here is the assignment (5 questions):
- (1 point)
Name one type of passive security threat and one type of active
security threat.
Briefly explain each type.
- (1 point)
Define and explain the differences between the three categories of
computer viruses.
- (1 point)
Encode this message.
- Given the following plain text input:
VACATION IS ALMOST HERE.
- And given the following encryption algorithm:
Substitute each letter with the letter that comes n
letters after it in alphabetical order, then transpose every
pair of letters in the input.
- And given the following key:
n = 3
What is the resulting cypher text?
- (1 point)
What is the difference between a symmetric and an
asymmetric encryption system?
Give an example of each.
- (1 point)
Name and explain two functions of a firewall.
Note that you do not have to submit anything to me by email -- but
you can email me your assignment if you won't want to have to print it
out. Otherwise, bring a hardcopy of the assignment to the final exam
on Wednesday Dec 21 at 8am (in 232NE).