Ik Rae Jeong Jeong Ok Kwon Dong Hoon Lee Stronger Chikazawa-Yamagishi ID-Based Key Distribution. 1379-1382 2009 92-A IEICE Transactions 5 http://search.ieice.org/bin/summary.php?id=e92-a_5_1379&category=A&year=2009&lang=E&abst= db/journals/ieicet/ieicet92a.html#JeongKL09b