Tell us about PKI and certificates — what operations have been performed with them?.

PKI (Public Key Infrastructure) is an open key infrastructure that provides the creation, distribution, management, and verification of digital certificates and keys.

Main operations with certificates and keys:

• Key pair generation: creating a private and a public key.
• Certificate Signing Request (CSR) creation: contains the public key and owner information, sent to the Certification Authority (CA).
• Certificate signing by CA: the CA verifies the data and signs the certificate, confirming its authenticity.
• Installation and distribution of certificates: certificates are installed on servers or devices to ensure security.
• Certificate verification: checking the trust chain, validity period, and whether the certificate has been revoked.
• Certificate revocation: in case of compromise or expiration, the certificate can be revoked (via CRL or OCSP).

In technical support practice, operations such as CSR generation, certificate installation on servers, updates, status checks, and troubleshooting trust chain and compatibility issues are often performed.