SSH passphrase

I am using Eclipse 3.1 with Subclipse 0.9.36. I use svh+ssh: protocol
and went through the dialogue for nominating the key file and
passphrase. It all seemed to work fine. I ticked the box for storing
the information and that seems to work fine. Two questions:

1. Is there a way of unstoring the information? I want to try using it
where I have to go through the dialogue every time to see how irritating
it is so as to decide whther to permanently store the information with
the attendant security risk.

2. Where is the passphrase kept? It used to be in
~/.subversion/auth/svn.ssh but isn't any longer -- I just need to check
security issues.

Thanks.

-- 
Russel.
====================================================
Dr Russel Winder                +44 20 7585 2200
41 Buckmaster Road              +44 7770 465 077
London SW11 1EN, UK             russel@russel.org.uk