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w2+30w+81
w2+27w+3w+81
w(w+27)+3(w+27)
(w+27)(w+3)
ac + xc + aw2 + xw2
c(a+x) + w2(a+x)
(a+x)(c+w2)
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Most Popular Content
1 page
Week 2 Maths
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Conduct an independent samples t-test (a.k.a., between-subjects design) comparing two independent groups on any variable o ...
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Question 1: Consider the linear block cipher with block length n and alphabet
{0, 1}. On the key space of matrices A ∈ {0, 1}
(n,n)
with det(A) ≡ 1
(mod 2), choose the uniform distribution. Show that this cryptosystem
does not have perfect secrecy.
(Use the definition of perfect secrecy, and find a counterexample with n = 2, for instance.) 2: Let n be a positive integer. A Latin square of order n is an n × n
array L of the integers 1, 2, . . . , n such that every one of the n integers
occurs exactly once in each row and each column of L. An example of a
Latin square of order 3 is as follows:
1 2 3
3 1 2
2 3 1
.
Given any Latin square L of order n, we can define the following
cryptosystem: Take P = C = K = {1, 2, . . . , n}. For 1 ≤ i ≤ n, the
encryption function Ei
is defined to be Ei
(j) = L(i, j). (Hence each row
of L gives rise to one encryption function.)
Give a complete proof that this Latin square cryptosystem achieves
perfect secrecy. (Use Shannon’s theorem).If the question descriptions not clear enough, please check the picture file I posted.
GCU The Process of Qualitative Coding Data & Deductive Coding Discussion
Describe the process of coding qualitative data. Identify the distinguishing factors between inductive and deductive codin ...
GCU The Process of Qualitative Coding Data & Deductive Coding Discussion
Describe the process of coding qualitative data. Identify the distinguishing factors between inductive and deductive coding.
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