Chapter 16
Access Control Mechanisms
CASSIO: Why, no. The day had broke
Before we parted. I ha’ made bold, Iago,
To send in to your wife. My suit to her
Is that she will to virtuous Desdemona
Procure me some accèss.
— The Tragedy of Othello, III, i, 32–36.
Recall the access control matrix discussed in Chapter 2. As in the theoretical model, an implementation of the array and the commands to manipulate it provide a mechanism that the system can use to control access to objects. Unfortunately, there are several problems with a straightforward implementation. On a typical system, the number of subjects and objects will be very large. Most entries in the matrix will be either blank (indicating no access) or the same (because implementations often ...
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