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DISCRETIONARY ACCESS CONTROLS
Teacher : Assoc.Prof.Dr. Dang Tran Khanh
Presenter: Vo Van My
12/11/15 www.cse.hcmut.edu.vn 1
Outline
Discretionary Access Controls DAC
Access Matrix Model
DAC in Relational Database DAC
Privileges
The System R Access Control Content–BasedAccess Control Demo
Q & A
12/11/15 www.cse.hcmut.edu.vn 2
Discretionary Access Controls
DAC is based on the identity of the user requesting access and on a set of rules, call authorizatons, explicitly stating which user can perform which action on which resource.
12/11/15 www.cse.hcmut.edu.vn 3
Discretionary Access Controls
DAC
Document1
Bob
12/11/15 www.cse.hcmut.edu.vn 4
Access Matrix Model
Access Matrix Model: The first discretionary access control model proposed.
Triple (S,O,A)
S: subject; O: objects; A: actions; A[s,o] : contains the list of actions that subject s can execute over object o
O1 … Oi … Om
S1 A[s1,o1] …
Si A[si,o1] …
Sn A[sn,o1]
A[s1,oi]
A[si,oi]
A[sn,oi]
A[s1,om]
A[si,om]
A[sn,om]
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