How to find who commits the build and revision number?

Hi folks,

I am using Hudson + Subversion to automate the build process.

Everybody triggers the hudson build process is "anonymous". And I don't want
to add extra authentication to Hudson.

So I want to know if it is possible to get information from Subversion about
who commits the change to the svn repository, and the revision number of
that commit.

THANKS IN ADVANCE.

-- 
Best wishes,
Kevin Wu