http://japan.cnet.com/news/sec/story/0,2000056024,20345327,00.htm
http://internet.watch.impress.co.jp/cda/news/2007/03/16/15110.html
http://itpro.nikkeibp.co.jp/article/NEWS/20070315/265262/?ST=security
http://www.itmedia.co.jp/news/articles/0703/15/news107.html
http://hatena.g.hatena.ne.jp/hatena/20070317/1174094966