What is Digital Signature and how does it work ?

What is Digital Signature and how does it work?  Signature is a sign of Umri Sahmati which we use in many places, now this signature has become digital. This post of ours is only about Digital Signature. In this post, we will learn in full detail about every fact related to this topic. Hindi information of digital signature.


In this digital age of today, everyone has a shortage of time, but as technology progressed, all the work started sitting at home, but some tasks were quite confidential, which could not be done without verifying the identity of the person.

Instead of physical proving this identity, Digital Signature was invented to digitally prove which is based on an advanced cryptography technology.


In 1977, the RSA algorithm was invented for the first time by Ronald R. and his colleagues, with the help of which a large number of digital signature codes could be obtained. Later, further improvements took place and it has been upgraded a lot since then.

This means that the digital signature has the same value as the signature done by hand. Nowadays, almost all the progress-making countries have given legal recognition to this Digital Signature in view of its usefulness and importance. Which includes India.

The IT Act was passed unanimously in India on 1 November 2000 and thus became legal in India. Let us now know what digital signature is about.

Table of Contents Show

What is Digital Signature?

A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. It is a special digitally signed code that is used to indicate the authenticity and acceptability of any online document.

A valid digital signature gives a recipient reason to believe that the message was created by a known sender (authentication) that the sender cannot deny sending (non-repudiation) the message.

Its value is equal to hand made signature. Although seen, the signature done by hand can be modified but this is not possible with digital signature.

How does Digital Signature work?

Digital signature providers use a special protocol called Public key Infrastructure (PKI). It uses this to generate 2 types of long mathematical code based on the details of the signer, which are as follows –

  • Private key
  • Public key

Whenever a document is signed electronically, it is generated by the signature key’s private key, which includes matching the document by mathematical algorithm, checking details, this process is called hash. This is the main security of digital signature.

Hash encrypt itself with the Signer Private key, as a result of which Digital Signature is created. A digital signature is attached to the document of the signer with attachments. With this, the time to sign the document and also the public key.

When this document is received by the receiver, it will use the public key found with the document to verify it. Which was created by the Signer. When the receiver uses the public key, then the hash code will be decrypt by the receiver’s public key.

You can understand it very well from the screenshot given below,


If that hash code matches the receiver’s public key, then it means there is no tampering in the document and it is real and if that code does not match the receiver’s public key decryption, then it means the document is not real. Or it is sent by someone else.

It is to be noted that nowhere in the above process has the document been decrypt. That is, the Digital Signature document verifies the identity of the Issuer that this document has been signed by a person of this name which is the original document.

What are private key and public key?

The private key is also called the secret key because it is next to the signer that is used to sign the document and the hash is encrypted with it.

The private key is not shared while the public key is an open i.e. Non secret key. Which the receiver uses to decrypt the data.

The private key and public key of each signer is unique, which never matches the other signer. The digital signature is verified by the Trusted Authority, which is called the CA or Certificate Authority. As our SSL certificate also provides a type of CA only.

Digital signature certifies that creation of the document has not been tampered with yet. Also, this document is also created from verified source.

Digital signature is used more in emails, business, software distribution, tax filling, tenders etc.

In the end, the most important thing is that despite being so reputed and authorized, its use is not valid under IT Act on will, lease paper, Divorce paper etc.

That is, no signature is valid electronically on the above papers.

Where to get Digital Signature?

 How to create Digital Signature? You can get digital signature from any valid CA (Certificate Authority) in India, for this PAN (Personal Account Number) card which is ID proof.

After this, an address proof like photo copy of electricity bill, water bill, ration card, passport, etc. and 4 own passport size photos are required to be sent to the CA office for self attested copy.

There are some (CA) Digital signature Issuer in India which are as follows-

Emudhra, CDAC, Safe Scrypt, n code Capricorn etc. are licensed by the Government of India as Certificate Authority.

What was this digital signature and how does it work in Hindi, in which you got information about digital signature and now you know about it well.

Hopefully this post of ours will prove useful to you and you must have got some interesting information from it.


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