Kunihiko Miyazaki Mitsuru Iwamura Tsutomu Matsumoto Ryôichi Sasaki Hiroshi Yoshiura Satoru Tezuka Hideki Imai Digitally Signed Document Sanitizing Scheme with Disclosure Condition Control. 239-246 http://search.ieice.org/bin/summary.php?id=e88-a_1_239&category=D&year=2005&lang=E&abst= 2005 88-A IEICE Transactions 1 db/journals/ieicet/ieicet88a.html#MiyazakiIMSYTI05