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What is a SSL digital certificate? How does the SSL certificate work? I believe there are many people do not understand, today, in order to let you know more about the SSL certificate, so give you a summary of the following content, let's look down together.

SSL digital certificate is a digital certificate issued by CA institutions to domain names or IP addresses to establish SSL encryption channels for clients and servers.

2. How does the SSL certificate work?

The basic principle is that when you install a SSL certificate on the server and the browser connects to it, the existence of the SSL certificate triggers the SSL (or TLS) protocol, which encrypts the information sent between the server and the browser (or between the server); the details are obviously more complicated.

SSL runs directly on the transmission control protocol (TCP), which effectively acts as a security protection layer. It allows the higher protocol layer to remain the same while still providing secure connections. Therefore, under the SSL layer, the other protocol layers work properly.

If a SSL certificate is used correctly, the attacker will be able to see which IP and port are connected and how much data has been sent. They can terminate the connection, but both the server and the user can know that this is done by a third party. However, they will not be able to intercept any information, which makes it actually an invalid step.

The hacker may be able to find out which hostname the user is connected to, but crucially, he cannot find the rest of the URL. When the SSL digital certificate is installed, the connection is encrypted and the important information is still secure.

1. After establishing a TCP connection, SSL starts working and starts what is called a SSL handshake.

2. The server sends its certificate to the user together with some specifications, including the version of SSL/TLS and the encryption method to be used.

3. Then, the user checks the validity of the certificate, selects the highest level of encryption supported by both parties, and uses these methods to start a secure session. There are many methods that have different advantages, which are called cipher suites.

4. In order to ensure the integrity and authenticity of all messages transmitted, SSL and TLS protocols also include an authentication process using message authentication code (MAC). All this sounds lengthy and complex, but in fact it is almost instantaneous.

Do you remember when we talked about the use of SSL certificates? Now why do I need an SSL certificate?

SSL certificates protect your sensitive information, such as credit card information, user name, password, etc. It also: ensure data security between servers, improve your search rankings, build / enhance customer trust, and increase conversion rates.

What is the SSL digital certificate? SSL certificate how to work to share here, I hope that the above content can have a certain reference value for everyone, you can learn to apply. If you like this article, you might as well share it for more people to see.

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