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It is important for servers, especially web servers, to generate their own Certificate Signing Requests (CSRs). This allows the server to maintain full control over the certificate request process. The server creates its own public/private key pair by generating a CSR in Debian. The server then fills in details for the CSR, like the domain name and organization information.
The CSR, along with the public key, is submitted to a Certificate Authority. The CA then issues an SSL certificate matching the CSR. When the certificate is installed on the Debian server, it can only be decrypted using the server’s private key. This ensures the certificate is securely bound to that specific server. By generating the CSR, itself, the Debian server has full transparency and control over the certificate information, providing more security for any connections that use the certificate.
sudo apt install openssl
openssl genrsa -out yourdomain.key 2048
openssl req -new -key yourdomain.key -out yourdomain.csr
openssl req -text -noout -verify -in yourdomain.csr
sudo apt install curl curl -O https://yourdomain.crt