Digital Signature - Internet Technologies

What is Digital Signature?

Digital signature is the key in security as they provide us to verify the author, data and time of signatures, authenticate the message contents. Additional capabilities are the authentication functions.

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A digital signature is tied to the signing user and also to the message.

Applications

Reasons to implement digital signatures to communications:

Authentication

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.

Integrity

Message is signed before sending. If the message is changed in between, it will invalidate the signature.

Non-repudiation

One cannot deny at a later time that the message is signed by him.

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