Haeryong Park Kilsoo Chun Seungho Ahn Cryptanalysis of the Hwang-Lo-Lin Scheme Based on an ID-Based Cryptosystem and Its Improvement. 900-903 2008 91-B IEICE Transactions 3 http://dx.doi.org/10.1093/ietcom/e91-b.3.900 db/journals/ieicet/ieicet91b.html#ParkCA08