Digital Signature
“If someone steals your password, you can change it. But if someone steals your thumbprint, you can’t get a new thumb. The failure modes are very different. — Bruce Schneier”
Digital Signature is an approach to safeguard the electronic documents which is exchanged between two parties. Making sure that the electronic documents like e-mails, ppt, word files, web applications etc is original/legitimate/accurate. This means, you know who sent it likewise you are sure that the original content is not altered or modified(authentication and non-repudiation).
“A right to not have your data rise up and attack you.” — Benjamin Wittes, Brookings Institution
Digital Signature are given lawful recognition, if the original data is manipulated or modified — you can file a trail (accusation/proceedings).
Get Mrs Rajiv’s stories in your inbox
Join Medium for free to get updates from this writer.
Now, in technical term: A digital signature is a encrypted version of a message digest, adhered to the original message. To be meticulous we HAVE to encrypt the hash function itself with the senders private key.
Let me explain this with an example: I am going to draw few pics for better understanding :)
Reference
