关键词: XML, 多级安全, 完整性, 可用性, 隐通道

Abstract: XML’s increasing popularity highlights the security need for XML documents.Researchers have paid more attention on discretional access control，role-based access control and view based technology，rather than mandatory access control.This paper focuses on the REMOVE operation of multilevel XML under the constraint of the hierarchy and the integrity.A novel policy “delayed-removing” is proposed which can avoid convert channel and keep the availability and the secrecy of higher level data element while removing the lower level data element.The integrity constraint and the implement of the policy are also detailed.

Key words: XML, multilevel security, integrity, availability, covert channel