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4. Digital Signature


Approach

A digital signature is created by a combination of a message Hash and private/public key encription.

A digital signature guarantees two things:
1. if the decrypted hash sum matches the hash sum of the plaintext, the plaintext received corresponds to the plaintext sent by the sender
2. if the hash sum can be decrypted with Sender A public key, it proves the document was indeed sent by Alice (actually, it only proves the document was sent by someone who has Sender A private key, which we take for granted is Sender A).[2]

Reference

[1] http://www.x500standard.com/index.php?n=X509.X509Overview
[2] http://www.carillon.ca/library/pkitutorial.php

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