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CSE 794Q Homework 3
Due: Wednesday, April 28, by class time
1.
What RC4 key value will leave S unchanged during initialization?
That is, after the
initial permutation of S, the entries will be equal to the values from 0 through 255 in
ascending order.
(Hint: for what values of T[0.
.255], it is always i = j in the loop of
Initial Permutation so that S[i] ends up swapping with itself?
Determine the value of
T[0], then T[1], T[2], and so on
2.
Consider a Feistel cipher composed 16 rounds.
Suppose that, for a given key
k
, the key
scheduling algorithm determines the first 8 round keys,
1
2
3
8
,
,
,
k
k
k
k
and then set
9
8
10
7
11
6
16
1
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 Spring '10
 TenH.Lai

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