Encrypt eSign PPT Later

How To Encrypt eSign Presentation

well after having produced keys and built a small web of trust earlier we're going to use that web of trust to sign and encrypt some files for a different recipient so first of all let me create a file locally which might be somehow important so let's see I'll just do something simple here let's say I want to send a message to someone so I mean it could be anything right it could be a PDF that you produced using la tech it could be a video it could be text you want to copy and do an email whatever the file is it doesn't really matter because this works on bit by bit basis so let me ask pursue simple text files say wow I just proved the Riemann hypothesis I sure hope my Fields Medal comes quickly so maybe this is a secret message that you don't that that you don't want anyone else to know except for an intended recipient so let me save this file I'll save it as also save my downloads directory as a secret message and I'll save it it doesn't matter where I save it as doesn't matter at all so let me save that and now in my downloads directory there's this file secret message so what I'd like to do is encrypt that for a different recipient so that only they can read it now actually this is not the typical thing one doesn't academic publishing or an open-source publishing for that matter because again you usually want your material to be to be publicly viewable but actually authenticated but I'll get to that later so I need to open my GPG keychain access to recall that I'm currently acting as a spur Benjamin Franklin because I have that that secret key that's my only secret key and suppose I want to send this to this person claiming to be Abraham David Smith so how do I send this file securely to that person well since I have their public key I can encrypt the file using their public key now as we said before when you make a PGP identity you have a public key and private key and those actors a yin and yang and if you have one the message is only useful if you have the other one whichever of the two you have so if i have someone's public key then I can use it to encrypt a file then only the person holding that private the corresponding private key can decrypt the file on the other side if I want to sign a file I sign it using my private key and anyone who has my public key can verify that it was signed correctly so in fact the math.max is identical going from public or private property to public the question is what's the purpose of that action it's very much actually like when you multiply matrices write a times B...