Digital Signature | How Digital Signature works

The digital signature is the technique to transfer the message from sender to receiver.

The receiver of the message can authenticate the sender of the message.

Message receive through a digital signature gives a guarantee that the message received is the same as forwarded by the sender.

The sender of the message cannot repudiate that it did not send the message.

It has three features: Authenticity, Integrity and Non-Repudiation.


Process of Digital Signature:
Sender Side (Signer):
i) Original Message first converted into hash code using a hash algorithm.
Message  Hash Code
Hello a101b
ii) This hash code is then encrypted by the Private Key of the sender, the encrypted hash code is called Digital Signature.
Hash Code  Digital Signature
a101b xxab1
iii) This Digital Signature is attached to the original message and forwarded to the receiver through the network.



Receiver Side (Verifier):
i) Receiver receives the message and separates the original message and digital signature attached with the message.
ii) Decrypt the separated digital signature by the public key of the sender.
Digital Signature   Hash Code ---- (A)
xxab1 a101b
iii) Separated Message converted into hash code using the same hash algorithm
Message   Hash Code ------- (B)
Hello a101b
iv) Both the hash code i.e. Hash Code (A) and Hash Code (B) are then compared. If both the hash code is the same, it means the message received from the sender is authentic.

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