Question: Bob has encrypted a single-block secret message using AES-128, with an insecure key. You know the first 15-bytes of his 16-byte key are all 0s,

Bob has encrypted a single-block secret message using AES-128, with an insecure key. You know the first 15-bytes of his 16-byte key are all 0s, but the last byte is unknown. The ciphertext he produced is: 5beed72ac6c91e16e5a705cbb4cf4417.

As stated, you know his key is of the form (in hex): 000000000000000000000000000000xx (for unknown xx).

What is the plaintext that Bob encrypted? Answer in ASCII or hex (but note the hex decodes to ASCII).

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