This is a note for my self to configure certificate for SCUP2011. These URLs have all the information required:
http://mikeshellenberger.wordpress.com/2010/09/02/system-center-updates-publisher-microsoft-pki/
http://www.stevensnet.com/Pages/Blogs/Blog_View.aspx?ArticleID=307
http://www.myitforum.com/absolutenm/templates/Articles.aspx?articleid=14226&zoneid=97