Answered: Figure A ОВJЕСTS Subjects Files…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Using a directed graph to represent each subject and each object by a node, depict the protection state
shown in the discretionary access control (DAC) model described in the textbook1
. An entity which is both subject
and object is represented by a single node. A directed line from a subject to object indicates an access right. A
label on that link defines the type of access right. Draw a directed graph that corresponds to the access matrix of
Fig. A (see next page).

Figure A
ОВЈЕСTS
Subjects
Files
Processes
Disk drives
S2
S3
F1
F2
PI
P2
D
D2
owner
read
Si| control
reade
wakeup
wakeup
seek
owner
owner
control
owner
control
write
execute
owner
seek
S3
control
write
stop
сору Паg set
SUBJECTS

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Step 1

b. Directed graph for Extended Access control matrix:

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