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In the last video you initialized a new get repository for the web server project.

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You also added a couple of commits and now we can take those comments and send them off to these third

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party services we want to use.

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Get hub and Heroku so they can access our latest code.

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That's how we get hub.

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We'll be able to host our project and how Heroku we'll be able to deploy the latest version of our application.

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Now the question is how do we transfer the code between our machine and the other third party services

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servers in a secure way.

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And the answer is to use S S H SS H stands for secure shell and it gives us a means of securely communicating

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with another machine.

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And in this video we're going to set up what's known as an SS H key pair.

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This is a set of two files which we'll be using to facilitate this secure communication.

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Now to actually generate these files all we need to do is run some commands from the terminal.

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Then in the next two videos we'll actually set things up with both get hub and Heroku.

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Now if you're on mac or on Linux you can stick with your standard terminal.

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If you are on Windows you need to use the get bash program.

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So remember when we first installed get I said that if you're on Windows as you move through the installation

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process you want to check that box that says install get bash.

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This is when we're actually going to use that program.

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The commands we're gonna run are not available to you from these standard windows command prompt.

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You need to use get bash to access them.

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Now if you didn't install get bash when you installed it you can always grab the installer again rerun

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it adding the option to install get bash then you can continue on with the lesson.

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So once again Windows users crack open get bash Mac and Linux users you can stick with your terminal

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right inside of Visual Studio code.

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Now the first thing we're going to do is see if we already have SS keys on our machine.

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It's possible you have them from another project you were working on the command we're going to run

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is L S now less allows us to list out the contents of a directory and this is going to allow us to check

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for existing keys so that's going to list out all of the files and folders inside of a given directory.

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We're gonna be running this with the a flag the a flag makes sure that even hidden files and folders

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show up these would be ones that start with a dot also known as DOT files and we'll also use the L flag.

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This is just gonna make the format a bit easier for us to read.

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It's gonna list everything out top to bottom instead of trying to use columns where we have things side

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to side and the last thing we need to provide is the path to the folder of which we are trying to print

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its contents.

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Now for us that is going to be the following It is Tilde forward slash dot SS H.

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So Tilde is a shortcut for your user directory then we're looking for the DOT SSA folder.

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Now there's a chance you don't even have this folder in which case the command is going to fail.

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That is okay.

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It's perfectly fine if you get an error something along the lines of directory not found in this case

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when I run it.

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The folder does indeed exist but there's nothing inside of it.

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I have dot which represents the directory and I have dot dot which represents the parent directory.

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There are no files inside of the dot SSA folder which means that I don't have any SSA age kids.

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Now if you have a file called I d underscore RSA and another called I d underscore RSA dot Pub.

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That means you do already have a set of SSA keys and you could choose to use those instead of creating

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new ones.

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There is no need to create new ones if you already have some in place.

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Now if you are seeing what I'm seeing and you have no files or you don't even have the folder it's time

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to run a couple other commands to create some SSA keys that we can use the command we're gonna use as

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SSA H hyphen key gen which is going to allow us to generate this SSA H key pair.

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The first argument of three we'll be providing is t which stands for type.

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There are various protocols we can use we'll be using the very popular and very secure RSA protocol.

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Now RSA doesn't stand for anything in particular related to software development.

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It's actually just the last name initial for the three creators of the algorithm.

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So after RSA we're going to specify B for bits we want to specify how many bits for this key we want

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enough to be secure.

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The most common value is forty ninety six so four thousand and ninety six bits for the key last up hyphen

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capital C make sure it's capital and not lower case.

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This is where we can provide a comment for the key what you can think of as a label and it's common

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to just use your email address inside of here and that's what I'm gonna do right here.

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Perfect.

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Now that we have this in place we can go ahead and hit enter to run the command.

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This is gonna bring us through a little wizard which is going to ask us a few more questions enter a

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file in which to save the key and by default you can see it storing it in that dot SSA directory inside

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of my user profiles folder and the file name is I d underscore RSA.

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I do want to use that default so I'll just hit enter to accept the default value shown in parentheses.

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Next up enter a passphrase.

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We're not gonna provide a passphrase so we can hit enter to use the default pass rage wishes no passphrase

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after that we hit enter again to accept our passphrase and then right here the key has been created.

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Now what we're gonna do is run that same Ellis command so I'm gonna use the up arrow key twice hit enter

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run it and now I can see I have two files I have I.D. RSA an I.D. RSA dot pub The first one is a secret

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file which we're gonna keep on our machine and we're never gonna share with anyone.

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The other is a public file and this is something we're gonna share with both.

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Get hub and her Roku so they can secure the communication between our machine and their servers.

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The last thing left to do is to make sure that our SSA key pair is actually used the next time we set

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up an SSA connection which we will be doing in the next two videos.

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The first thing we need to do is make sure the program is running and then after that we're going to

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register our new private key file.

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So right here altogether we're gonna run the following command.

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It is e Val.

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Now if you are on Windows you're going to leave the next character off if you're on mac or linux.

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You add the quote in after that it is dollar sign open and close parentheses.

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Then once again on windows nothing on Mac and Linux.

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Add that quote in then inside of the parentheses the command which would be SS H agent asked to start

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that up.

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So all this command is going to do is that's going to try to start up SS H agent if it's already running

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it's going to simply tell us that by printing the process I.D. if you're on Windows you should have

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this command minus those two quotes.

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I'm gonna go ahead and run it.

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And what do I get.

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I get Agent PD 8 7 4 3 which means that things are already running after running this command.

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The last thing to do is to register the file that's SS H hyphen at now.

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If you're on a Mac you have to use the hyphen capital K a flag.

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This is going to make sure that things get added correctly.

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If you're on Linux or Windows you do not want to use that hyphen capital K as it'll cause a problem.

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From here we simply provide the path to that private key file dot pub is the public one the other one

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is the private one that is Tilde forward slash dot SS H forward slash I d underscore R S A when we run

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that command we can see the identity has been added now when we try to facilitate an SS H communication

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we'll be able to do it securely using our key pair.

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Now at this point we haven't actually used the key pair to do anything in the next video we're going

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to address that by getting our code pushed up to the github servers.

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I'm excited to get to that let's go ahead and jump right in to the next video.