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What is the root certificate? What's the use?

What is the root certificate? What are the functions of them? Recently, many friends have been asking me this question. Next, let's take a look at what the so-called root certificate is.

The root certificate is a digital certificate issued by CA Certification Authority, which can represent the identity of CA institutions. The installation of the root certificate representative is trusted by CA Certification Authority.

The issuer of the root certificate is itself, and downloading the root certificate indicates that you trust all certificates issued below the root certificate.

Root certificate composition

The certificate consists of three parts: the user's information, the user's public key, and the signature of the CA center to the information in the certificate. To verify the authenticity of the certificate (that is, to verify whether the signature of the CA center to the certificate information is valid), you need to use the public key of the CA center to verify, and the public key of the CA center is located in the signing certificate, so if you want to use the certificate to verify the authenticity of the certificate itself, you need to use the certificate issued by the certificate to verify, so it will form a certificate chain relationship, so where is the end point of this certificate chain? The answer is the root certificate.

What is the use of the root certificate?

When issuing other user certificates, CA Certification Authority calls the signed private key of the root certificate to digitally sign it. In the practical application of the digital certificate, the CA root certificate must first be used to verify the validity and validity of the user certificate, so the user must first install the CA root certificate.

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