Digital SignatureA digital signature is a mathematical scheme for demonstrating the authenticityof a digital message or document. A valid digital signature gives a recipient reason tobelieve that the message was created by a known sender, and that it was not altered intransit.Digital signatures are commonly used for software distribution, financialtransactions, and in other cases where it is important to detect forgery.
Some FactsIt is based on asymmetric cryptography.RSA algorithm could be used to produce primitive digital signatures.Rivest-Shamir-AdlemanThe first widely marketed software package to offer digital signature was LotusNotes 1.0, released in 1989, which used the RSA algorithm
Uses Of Digital SignatureAuthentication - Digital signatures can be used to authenticate the source of messages.Integrity - It may be possible to change an encrypted message without understanding it. However, if a message is digitally signed, any change in the message after signature will invalidate the signature.Non-repudiation – A person who has signed some information cannot at a later time deny having signed it.
How to Add digital Signature toMicrosoft WORD Document