Plesk and HTTPS for subdomains

[MaximillianM]

Hi. I have a question about Plesk and Plesks own Certificate.

I installed phpmyadmin on a subdomain (phpmyadmin.mydomain.de). I password-protected the whole subdomain. Now i want to protect the traffic between my PC and my vServer.

My question: DO i need a SSL Certiface from like "easySSL" or is the certificate of Plesk enough for protecting the traffic? How would you protect a subdomain which is used for just phpmyadmin?