A digital signature is tied to the signing user and also to the message.
Reasons to implement digital signatures to communications:
Using digital signatures, we can know the person who sent the message. Consider, if a bank’s branch office sends a request to central office for change in balance of an account. If the central office cannot authenticate that request is sent from an authorized source, acting of such request could be a huge mistake.
Message is signed before sending. If the message is changed in between, it will invalidate the signature.
One cannot deny at a later time that the message is signed by him.
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