Question: The process of A s encrypting a message M as C and B s decrypting the encrypted message C to M . ( 3 pts

The process of As encrypting a message M as C and Bs decrypting the encrypted message C to M.(3 pts each, total 6 pts)
On top of As encryption, if A wants to also inform B that the encrypted message C is indeed sent by A, what should A do?(2 pts)
How can B verify the encrypted message is sent by A?(2 pts)

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