What are the requirement to complete this task?

The encrypt and decrypt methods should accept an array of bytes instead of a string. Any conversion code within the methods should be removed under the assumption that the conversion will occur before the method is called.

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Updated to high priority

I updated encrypt and decrypt to take as arguments and return byte arrays. I updated the smoke test to take the changes into account.

Alex, as a sanity check can you verify the results are what you expect?