Exercise 5.2.1 Consider the following access-control matrix for subjects S1 S3 and objects O1 04 (the owner of each object appears in parentheses): Sub ject 01(S1) S1 read, write 02(S2) read 03(S3) 04(S4) read read S2 S3 read, write read read read read read read, write read, write Use the access-control logic to formulate the access-control rules for each object.

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
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Exercise 5.2.1
Consider the following access-control matrix for subjects S1 S3
..
and objects O1.04 (the owner of each object appears in parentheses):
Sub ject 01(S1)
S1 read, write
02(S2)
read
03(S3)
read
04(S4)
read
read
S2
S3
read, write
read
read
read
read
read, write
read, write
Use the access-control logic to formulate the access-control rules for each object.
Transcribed Image Text:Exercise 5.2.1 Consider the following access-control matrix for subjects S1 S3 .. and objects O1.04 (the owner of each object appears in parentheses): Sub ject 01(S1) S1 read, write 02(S2) read 03(S3) read 04(S4) read read S2 S3 read, write read read read read read, write read, write Use the access-control logic to formulate the access-control rules for each object.
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