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Can I Certify Electronic Signature Presentation

hello and this is sunny welcome back today my topic is digital certificate before I explain digital certificate we need to understand how digital signature works and find out the weakness with a digital signature and thus we could understand why detailed certificate is necessary the following example demonstrates how digital signature works here is the scenario Bob wants to send a detailee signed message to Alice first barbra creates a parable Keys public key and a private key he keeps his private key and put his public key in a public place then Bob creates his message and uses his private key to assign the message and sends them to Alice when Alice the guests Bob's a digitally signed message she goes to get his public key and she use it to verify Bob's digital signature if Alice verify the Bob's detail signature with his public key she has reason to believe the message was created and sent by Bob and his message was not ordered in transit I have one video about digital signature it shows how it works in detail I put is link below if you want to fully understand digital signature you can watch that video first otherwise please continue as we look at the example how digital signature was created and how it was verified we find out there's one bigger problem let's look at this example again first Baba creates a pair of icky public key and private key it keeps his probably the key and put in his public key in a public place then Bob creates his message and it uses his primary key to de tolly sign the message and sends them to Alice now the problem suppose a hacker intercepts Bob digitally signed message the hacker simply throws them away and it creates a whole new package a craze his own public key and a private key and put his own public key in public place just like Bob the heckler creates a totally different message and it creates our hackers own signature with his own private key the hacker says them to Alice he tells Alice this is Bob please go to get my public key so that you can verify my dito signature and my digitally signed a message Alice gets hackers public key and use it to verify hackers a signature and of course everything would work fine but Alice has no idea about the true identity of the sender because anyone can pretend to be Bob therefore there's one weakness in digital signature lack of authentication digital signature itself does not verify to identity of the sender and his public key the solution is digital certificate [Music] these are certificates are electronic credentials issued by trusted third-party a detail certificate not only verified identity of the owner but also verified the owner owns the public key use the same scenario as an example when Bob sends public key to Alice he does not ask her...