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when youre sending off your presentations and people are asking if this presentation is really from you you may want to consider getting a digital signature because it will confirm the identity of the person who sent the presentation and theyre typically issued by a certification authority or CA a trusted third party and in it itll contain a serial number digital signature of issuing authority expiration dates and the name and copy of the certificate holders public key so the user can verify that the certificate is authentic so once the signature is attached to a document or in this case this PowerPoint presentation it cant be modified without first removing the digital signature and anybody can remove it okay whats the purpose of doing it well its not like a password protect its a way to verify that its from you that you created it that when you send it off to the person is from you and it hasnt been tampered with if it has then you wont see that persons digital signature