Digital Signature

Digital Signature

Digital signatures are the public-key primitives of message authentication. In the physical world, it is common to use handwritten signatures on handwritten or type messages. They are used to bind signatory to the message.
Similarly, a digital signature is a technique that vines a person/entity to the digital data. This binding can be independently verified by the 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. Importance of digital signature:

Message authentication

part from the ability to provide non-repudiation of messages, The digital signature also provides message authentication and data integrity. Let us briefly see how this is achieved by the digital signature -Message authentication – when the verifier validates the digital signature using the public key of a sender, he is assured that the signature has been created only by the sender who poses the corresponding secret private key and no one else.

Non-repudiation

Since it is assumed that only the signer has knowledge of the signature key, he can only create a unique signature on a given data. The receiver can present data and the digital signature to a third-party as evidence if any dispute arises in the future.

Data integrity

in case an attacker has access to the data and modifies it, the digital signature verification at receiver end fails. The hash of modified data and output provided by the verification algorithm will not match. Hence, the receiver can safely deny the message assuming that data integrity has been breached.

Public key

Out of all cryptographic primitives, the digital signature using public key cryptography is considered as a very important and useful tool to achieve information security.

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