Exercise 9.2.22. Suppose that (aod) e (boc) has an inverse in Z26: that is to say, suppose there is a ke Z26 such that k o ((a o d) e (bo c)) = 1. 9.2 PRIVATE KEY CRYPTOGRAPHY 275 Show that the matrices: A- (: :) kod -ko b -koc koa a b and B= ( are inverses of each other in Z26. That is, show that AB = BA = I under matrix multiplication mod 26.
Exercise 9.2.22. Suppose that (aod) e (boc) has an inverse in Z26: that is to say, suppose there is a ke Z26 such that k o ((a o d) e (bo c)) = 1. 9.2 PRIVATE KEY CRYPTOGRAPHY 275 Show that the matrices: A- (: :) kod -ko b -koc koa a b and B= ( are inverses of each other in Z26. That is, show that AB = BA = I under matrix multiplication mod 26.
Advanced Engineering Mathematics
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ISBN:9780470458365
Author:Erwin Kreyszig
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Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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Transcribed Image Text:Exercise 9.2.22. Suppose that (aod) e (boc) has an inverse in Z26: that
is to say, suppose there is a k e Z6 such that ko ((a o d) e (bo c)) = 1.
9.2 PRIVATE KEY CRYPTOGRAPHY
275
Show that the matrices:
4 - (: :)
B - (*
a
kod -k o b
A =
and
-k oc koa
are inverses of each other in Z26. That is, show that AB = BA = I under
matrix multiplication mod 26.
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