a$.$ Using the two keys $($memory words$)$ cryptographic and network security, encrypt the following message:

$"$Be at the third pillar from the left outside the lyceum theater tonight at seven. If you are distrustful bring two

friends."

Make reasonable assumptions about how to treat redundant letters and excess letters in the memory words and how to

treat spaces and punctuation. Indicate what your assumptions are.

b$.$ Decrypt the ciphertext. Show your work.

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