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There are three recognized categories of SSL certificate authentication types: Extended Validation (EV) Organization Validation (OV) Domain Validation (DV)

An X. 509 certificate is a widely used digital certificate format based on asymmetric cryptography. Each certificate uses a pair of encryption keys known as the public and private key. In a nutshell, the private key on a certificate can generate encryption that can only be decrypted by its public key partner.

X509 extensions are dynamic, extended properties that can be added to an X509 certificate and changed. The X509Extension class can be used to create extensions that are associated with a certificate but are not part of a certificate as issued by a certification authority (CA).

Key usage extensions define the purpose of the public key contained in a certificate. You can use them to restrict the public key to as few or as many operations as needed. For example, if you have a key used only for signing or verifying a signature, enable the digital signature and/or non-repudiation extensions.

X. 509 Certificate Renewal Sign in to your certificate provider's website. Select your certificate and follow the instructions to renew and to pay for the renewal. After your provider has verified the purchase, you may download a new certificate. This will contain two . CRT files.

How to Renew an SSL Certificate Set reminders for SSL expiration. Generate a Certificate Signing Request. Purchase and activate your new SSL certificate. Complete domain control validation. Install your new SSL certificate.

Certificate extensions are information fields that provide additional information about the certificate. Certificate extensions provide a means of expanding the original X. 509 certificate information standards.

An X. 509 certificate is a digital certificate based on the widely accepted International Telecommunications Union (ITU) X. 509 standard, which defines the format of public key infrastructure (PKI) certificates. They are used to manage identity and security in internet communications and computer networking.

SSL/TLS X. 509 certificates are digital files that are used for Secure Sockets Layer (SSL) or Transport Layer Security (TLS). An SSL/TLS certificate is one of the most popular types of X. 509 certificates or a type of public-key certificate which uses the X.

.pfx (PKCS12) A PKCS12 file has an extension of . pfx. It contains a certificate (CA-issued certificate or self-signed certificate) and a corresponding private key. Use this format to transfer the contents of a keystore to a separate computer.