1. Temporal Location-Aware Access Control Model
By Yu, Lijun

2. Location-based access control model
Significance of using location as a means of authentication & authorization
Military, Location aware computing
Technologically possible to track user and object location at a acceptable precision
GPS, RF-ID
Location-based Services
A series of related work by Denning, Leonhardt. et al, etc.

3. Location-based access control model
Location is modeled as a set of points
Location constraints on
User assignment
Permission assignment
Role activation
Permission (object location)
Users have dynamic access control at different user location and object location

4. Temporal RBAC model Express wide range of temporal constraints
User assignment
Permission assignment
Role activation
Role enabling
Constraints
Temporal constraints can be
Duration constraints
Periodic constraints

5. Temporal RBAC model Run-time requests Trigger
User-Role activation
Role enabling/activation/assignment
Trigger
Conflicts and conflict resolution
Execution model

6. Motivation
A boss agrees with the employees that he can track employees’ location only during office hours, i.e. 9AM – 5PM, M-F
Bob paid twenty dollars per month for roadside assistant service so that he can use that service for up to thirty hours per week
Solution: A combined temporal and location based RBAC model

7. How Based on the notations defined in TRBAC and GTRBAC
Location-based event expressions
Location-based role triggers
Location and temporal constraints conflicts
More work on the event model