Question: Alice needs to send Bob a message over the network containing sensitive information. They both have a symmetric key to use for signing and encryption.

Alice needs to send Bob a message over the network containing sensitive information.
They both have a symmetric key to use for signing and encryption. Alice generates a
signature for her message, appends it to the payload, and encrypts it. She then sends
the encrypted payload and the generated nonce to Bob. Are there any flaws with this
approach? What attacks might this transaction be susceptible to?

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