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Anonymous joshephn
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2 weeks ago
I know the answer of the first part is the first matrix, but im unsure on how to do the second part.

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Assessment (Portfolio Week 5): Problem-solving exercise
Submit your answer to this question on your Week 6 workshop day
9. Matrices can be used to send encrypted messages. Say you have a message matrix M and an
encryption matrix E. The encrypted message will be the product of those two matrices, i.e.
A = EM. In the matrix A, the numbers of M will be mangled with those of E. Unencrypting
the message requires performing the reverse operation to retrieve M from A.
You have been sent an encrypted message:
3m —5i
—m +2i
and two possible encryption keys
—5
12—51
21—4
3
3t 3h—5v 3s—5e
—t 2v—h 2e—s
—8
3
(a) Without performing any calculation, determine which of the encryption keys was used
to encrypt the message.
(b) Decrypt the message, i.e., find M from A using either El or E2 in an appropriate way.
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AnonymousAnonymous
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