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i do want to talk about certificates at some point but kind of the way that the certificates work is that they have these really important digital signatures at the bottom and they kind of underpin the whole thing so rob did a video already on public key cryptography which is a really good watch and you should definitely you know check that out so if you recall in public key you have a public key and you have a private key and they're kind of the inverse of one another so you can encrypt with one and decrypt the other one so i can for example if you have a public key i can encrypt something with it and send it to you right but actually we don't tend to do that very often we could do that but encryption with something like rsa is not that quick and for very long messages becomes a little bit impractical there are other reasons as well in terms of the fact that we use these keys for very long time and people prefer to rotate keys more often so these days for actual encryption what we would tend to do is just encrypt things using something like aes and symmetric keys so you use this kind of thing to verify who you are and then move on and establish something else yeah that's exactly right the way that we use something like rsa or the other signature schemes is going to be that we verify the identity of one of the people in the conversation and then we revert to regular symmetric photography right and we'll have done a key exchange or something like this i mean we talked about this in the tls video right so part of tls is a certificate and a digital signature and it only forms a part of the handshake after which we just consider that done and then we move on right um so what is a digital signature right that's i suppose that's the first question in my head i've got this idea of kind of like a bitmap 8-bit version of signing your name right i mean there are obviously lots of cryptographic things that we have to tick off right to make sure it's not forgivable but the idea is that i have a document or a message or something that i want to send you and i want to prove that it was me that sent it and so to do that i'm going to use my private key to sign a digital signature and basically what you're going to do on your end is verify that signature and verify that it was actually me that encrypted it that that's the idea so when we perform this process what we tend to think of is the person that's doing the signing and the person that's doing the verification right now i you know i might nod to rsa or something...