Zaphraud is Jason Kennerly, born April 7, 1975 in Camarillo, CA.
His most well known publication is probably either "Life Under GTD5" in the Summer 1994 issue of 2600 Magazine, a bottoms-up user perspective on GTE California's diagnostic systems, or "Exploiting LiveJournal.com with Clickless SWF XSS", a greyhat security article submitted for the Spring 2007 issue after LiveJournal staff (then in Oregon) had made the appropriate corrections to their server software.
Note for username globalization effort: I've lost track of the login for the .cn wikipedia where I edited an article about pac-man or something once, but that is me also.