April 2000
SC223 : COMPUTER SECURITY

QUESTION 3

Total Marks: 15 Marks

• Question 1
• Question 2
• Question 4
• Question 5
• Cover Page

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SUGGESTED SOLUTIONS
for Question 3

(a)Explain what is meant by the terms ‘operating system kernel ’and ‘security kernel ’.
[2 marks ]

(b)Describe three features that distinguish a security kernel from a distributed collection of security mechanisms,and explain the benefits that derive from these features.
[6 marks ]

(c)Describe two possible disadvantages of security kernels.[2 marks ]

(d)Give five reasons why simply deleting a file on a PC does not prevent that file from being recovered.[5 marks ]