While performing cryptanalysis we can change data from one form to another by using digital signature.

Digital signature are just like the original signature of the person that the person puts on the document.

It is like a public key that is used to attach and send the data over the network.

The digital signature can ensure of non-repudiation means no one can deny that this document is not being sent by their end.

These features are every bit as fundamental to cryptography as privacy, if not more.

It is like public -key that is used for providing the message authentication of the message being sent by the user.

Similarly, a digital signature is a technique that binds a person/entity to the digital data. This binding can be independently verified by receiver as well as any third party.

Digital signature is a cryptographic value that is calculated from the data and a secret key known only by the signer.

In today's era the person who sends the message will be the only one who sends it not the organization.

So this will put the companies on the safe side if mistake is done by their employees.

The basic manner in which digital signatures are created .

Instead of encrypting information using someone else's public key, you encrypt it with your private key. If the information can be decrypted with your public key, then it must have originated with you.

Facilities provided by digital signature

Message authentication

Data Integrity

Non-repudiation