Certificate authentification

Hello,

concerning the authentification on a svn server via a https connexion,
I'd like to use a SSL certificat management, especially to use my
certificate protected by a non-empty passphrase. Is there another way to
avoid to provide the passphrase on every svn request than to fill the
ssl-client-cert-password variable in the servers file ? A built-in proxy
for example ?

Thanks for any help!
Frederic Melot