You must reach out directly to your organization's IT department, DevOps team, or the provider of the service you are trying to access. What to ask for:

# Generate a new Certificate Authority (if you don't have one) openssl genrsa -out client-ca-key.pem 2048 openssl req -new -x509 -days 3650 -key client-ca-key.pem -out clientca.pem

sha256sum clientca.pem # Output should match the provided checksum

: It is most commonly used in environments requiring high security, where both the server the client must prove their identity to each other. Why would you need to download it? You would typically download a clientca.pem file if you are setting up: VPN Access

Unlike a server certificate (which proves the server's identity), the clientca.pem file is used by the server to verify the identity of the client. When a client attempts to connect, the server checks the client's certificate against the authorities listed in this file.