基金Supported by the National High-Tech Research and Development Plan of China under Grant Nos.2006AA01ZA45, 2006AA01Z410 （国家高技术研究发展计划（863）） the National Information Security Research Plan of China under Grant No.2006A30（国家242信息安全计划）+1 种基金 the Electronic Development Fund of the Ministry of Information Industry of China under Grant No.[20061634 （信息产业部电子发展基金） the IBM Ph.D. Fellowship Plan（IBM全球博士生英才计划）
