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when you're 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 they're typically issued by a certification authority or CA a trusted third party and in it it'll 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 can't be modified without first removing the digital signature and anybody can remove it okay what's the purpose of doing it well it's not like a password protect it's a way to verify that it's from you that you created it that when you send it off to the person is from you and it hasn't been tampered with if it has then you won't see that person's digital signature attached to it and so in which case one of two things has happened either they forgot to digitally sign it or they sent it off but somebody intercepted it made changes to it and well then you can't trust it so you can go ahead and talk to the person again call them up and say hey I don't see a digital signature and they can go oh yeah I forgot then they can be send it with it or they may say I did sign it so it's probably been tampered with I'll send you another one and you can discard the one that doesn't have the digital signature attached to it so to go ahead and add a digital signature to the presentation well first of all come with me up here to the file tab backstage info selected by default click on protect presentation and then down here there you go add a digital signature ensure the integrity of the presentation by adding an invisible digital signature well it's not invisible I'll show you where it's at and look at that you got a document with a little red ribbon something like you get in a County Fair hey your first place well in this case it's the authentication that this document is really from you that you digitally signed it now before you can go ahead and digitally sign it you got to sign up with the certification authority a trusted third party and if you want to find out a few that microsoft recommends then well it's not here in PowerPoint let me go ahead and come down here and right click on word to open up the jump list to open up Microsoft word with a left-click and the reason why I open up word because I covered this in my word training video how to create a digital signature and in word if you don't have...