He wants to make certain that the communication through message is not tampered with while in transit. The integrity of cryptography is bob attempting to achieve.
What do you mean by message?
A message is a distinct unit of communication intended for consumption by some recipient or set of recipients by the source. A message can be conveyed via courier, telegraphy, carrier pigeon, or electronic bus, among other methods. A broadcast's content can be a message. A conversation is formed through an interactive exchange of messages. A press release is an example of a communication, which can range from a brief report or statement issued by a government body to commercial publicity material.
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