digitalsignature

Digital Signature

Digital Signature provides the recipient the following:

authentication

non-repudiation

sender cannot deny having sent the message

integrity

How are they created

hash the data

use private key to encrypt the hash, lets call it hash A

the encrypted hash is the digital signature

How are they verified

decrypt the digital signature using public key of the sender

This will create the original hashed doc, hash A
next apply the same algorithm to hash, hash A -> hash B
compare (hash A, hash B) are the same, then bob has verified the signature