Extending XACML to Support Credential Based Hybrid Access Control

Various research efforts are in progress to enforce credential based access control using XACML standard. The current standard of XACML supports attribute based access control. While XACML accepts certified attributes through digital certificates, it does not support credential based access control in which the access conditions are defined not only in terms of credential attributes but also in terms of types of credentials. Credential based hybrid access control has been proposed for systems having diversified access control requirements. The use of various types of credentials in access control policy specification provides easy and immediate access to unknown user in open access environment.