Security in Computing, Third Edition

4.10. Exercises

1:	Give an example of the use of physical separation for security in a computing environment.
2:	Give an example of the use of temporal separation for security in a computing environment.
3:	Give an example of an object whose security level may change during execution.
4:	Respond to the allegation “An operating system requires no protection for its executable code (in memory) because that code is a duplicate of code maintained on disk.”
5:	Explain how a fence register is used for relocating a user's program.
6:	Can any number of concurrent processes be protected from one another by just one pair of base/bounds registers?
7:	The discussion of base/bounds registers implies that program code is execute-only and that data areas are read-write-only. ...