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All right, we're almost going to end this wonderful section of cryptography, so this is the second



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last lecture and in the next lecture we'll obviously talk about the certificate authority.



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So what is actually SSL?



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Well, SSN stands for all these secure sockets layer.



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Now, this is actually a protocol which is which works at the application layer of the OS model and



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the model that is the network model.



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So if you have knowledge about networking, you might have heard of ESSES it.



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Basically, SSL was developed by Netscape for managing the security of messages.



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So whatever you send over the Internet, obviously it should be protected from hackers who are about



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to carry out some sniffing of your messages.



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Now SSL uses the Odyssey algorithm, which is the public will go to them to encrypt the data.



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So we have seen Oddisee algorithm previously in this section.



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It's basically it's a measure taken to protect data, whatever you are sending over to the Internet.



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So the first step is actually client installs or client messages, the server to initiate the communication.



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All right.



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It's similarly to a man to man conversation.



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Someone has to initiate the conversation.



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So the client initiates the conversation for the SSL or dials Yellowstone's for transport layer security



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assistant and TSL work together again.



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Uh, TLT is a protocol which is actually used to establish a secure connection.



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So SSL is used for secure sending, but yellers is used for establishing a secure connection between



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the sender receiver.



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So once a client initiates the SSL or tearless communication server sends back and encrypted public



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key certificate.



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So what is the certificate we have seen now?



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Client checks, the certificate it creates and then sends the encrypted key back to the SO.



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So you have to send a confirmation message so that the server will also know that you have got the certificate



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again server decryption key and delivers the encrypted content with the key to the client.



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And again, client decrypt the content, completing the assistant idealist handshake.



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Again, it's public encryption where you end up with something and you decrypt another key basically



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for secure sharing of messages.



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A peerless handshake allows the client and server to authenticate each other.



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So, uh, selecting the encryption algorithm, the proper encryption algorithm, and you have to exchange



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the key, as we have discussed here, prior to the exchange of data.



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So before you exchange any actual data, you have to exchange the keys.



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So you can see that server has the key right here and the server sends an encrypted public.



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This is how this all works and deals works, and in in the last lecture of this section, we are going



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to talk about certificate authority.



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It's going to be a very short lecture of two to three minutes.



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You just have to understand what exactly is a certificate authority.