Digital Signatures

Digital signatures also use public and private keys, but they don't work like SSL.

Authenticity and Integrity

They only prove the message came from a given sender and wasn't tampered with.

To prove the message came from a given sender, the public key isn't sent in the signature. Instead, you get the sender's public key from a registry.

data isn't encrypted

The data itself isn't encrypted. Digital signatures only check that the data sent at the source matches what was received.

digital signature and e-signature aren't same

Adding signatures in a PDF gives e-signatures. They're NOT digital signatures.