What is a digital signature?

We all use a signature on a document as proof of identity and intent. This assures that someone cannot deny the validity of the content in that document.
In the digital era, we called it a “digital signature” which proves the origin of the data and its integrity. Digital signatures are everywhere. It is an electronic verification of the sender for the document. A digital signature helps in maintaining evidence so that the sender and receiver of the data cannot deny the communication involved. This situation is called as “Non-repudiation” in the security world.
The digital signature provides proof of the sender’s identity and also ensures that the message was not altered in transit. Digital signatures are frequently used where it is important to detect tampering and forgery.

How does it work?

Generally, the following steps will need to occur:
Note
Using a digital signature does not mean that content is encrypted.