Dae Hyun Yum Pil Joong Lee Invisibly Sanitizable Signature without Pairings. 1541-1543 2009 92-A IEICE Transactions 6 http://search.ieice.org/bin/summary.php?id=e92-a_6_1541&category=A&year=2009&lang=E&abst= db/journals/ieicet/ieicet92a.html#YumL09