%0 Journal Article
%T Role-Based Authorization Constraint with Time Character<br>带时间特性的角色授权约束
%A DONG Guang-yu
%A QING Si-han
%A LIU Ke-long
%A <br>董光宇
%A 卿斯汉
%A 刘克龙
%J 软件学报
%D 2002
%I 
%X Authorization constraint is an important part in role-based access control models. There are some methods to specify constraint formally, but they mainly focus on the static character. A formal model is proposed to describe time character of constraint in this paper. A founded constraint model, namely a constraint specification language, is studied in detail, and is extended. The language is called RCLT (role-based constraints language with time-character) after extending. At the same time, the problems of optimizing the efficiency RCLT system and restoring to the safe when rules are violated are discussed.RCLT is testified to be able to express the time chracter of constraint well.However,there are further works to be done for finding practical,efficient and general algorithms for optimizing efficiency efficiency and the restoration of safe state,which is the main goal of future research.
%K information security
%K access control
%K role
%K constraint
%K time character<br>信息安全
%K 访问控制
%K 角色
%K 约束
%K 时间特性
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=7735F413D429542E610B3D6AC0D5EC59&aid=20CABC8A3BA06AE0&yid=C3ACC247184A22C1&vid=FC0714F8D2EB605D&iid=5D311CA918CA9A03&sid=ECD12A4C29B53D67&eid=599BE0AAD31F648B&journal_id=1000-9825&journal_name=软件学报&referenced_num=38&reference_num=5