April 2000
SC223 : COMPUTER SECURITY

QUESTION 4

Total Marks: 15 Marks

• Question 1
• Question 2
• Question 3
• Question 5
• Cover Page

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SUGGESTED SOLUTIONS
for Question 4

(a)Approaches to protecting PC software from copying may be software-based (for example,checksums to prevent modification),hardware-based (for example, implementing a program as a chip),or a mixture of the two (for example,a key or ‘dongle ’).Identify a problem with each method.[3 marks ]

(b)Why might a software developer not protect their software from copying at all? [2 marks ]

(c)Wire,wireless and fibre-optics are three kinds of communication media.
(i)Describe two security concerns of wire media.[2 marks ]
(ii)Describe two security concerns of wireless media.[2 marks ]
(iii)Fibre-optic media is the most secure;why is it not universally used?[2 marks ]

(d)Identify the two kinds of encryption that can be used in a network,and explain the differences between them.[4 marks ]