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hey everyone in this video I'd like to take a look at using open SSL to create a certificate authority and then using that certificate authority to create a signed host certificate so this can be useful for several situations one of them is just development where you just need a certificate authority and maybe a few host certificates to use for testing but it's also useful for maybe production environments if you want some sort of internal PKI that you don't need to be globally trusted so you don't want to go out and pay for a certificate and you don't need to then having this skill is potentially pretty useful and it doesn't require for instance some Active Directory certificate services you can do it with open SSL for free so let's take a look at how to do this first thing I want to point out is that I have these notes up on our github page so if you want to refer back to them when you're doing these these activities you can do that so I've got a single document here for ECDSA and then a sort of a matching document for RSA depending on which type of asymmetric cryptography you'd like to use in this video we're going to demonstrate ECDSA but I did put both up because people have their preferences so we're going to in this video make a certificate authority and then we will make a single host certificate and sign it using that certificate authority so the first step we have to do when we're using asymmetric crypto or in this case not asymmetric crypto but specifically elliptic curve cryptography is we have to pick which curve we want to use so let me kind of rearrange the screens here like thus and let's let's begin demonstrating this i'm on linux this will work these commands will work exactly the same on Mac OS on Windows there might be a little bit of wonkiness with the command line so you might have to like quote certain things that you wouldn't otherwise have to quote I'm not sure but I have gotten this to work on PowerShell it just requires a little bit more finessing but we're going to demonstrate this on Linux this is just a some virtual machine running in the cloud somewhere so let's let's start this up first thing we want to do when we're creating a certificate authority with elliptic curve cryptography is we want to see what curves we have available to us and the way to do that you can run OpenSSL EC per M and then - list underscore curves and then on UNIX platforms you can actually pipe that into less so it doesn't just spit out this huge list at you at once right so you can actually kind of poke through it so when we do this notice that there are a lot of options here so lots of different...