December 1999
SC223 : COMPUTER SECURITY

QUESTION 5

Total Marks: 15 Marks

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SUGGESTED SOLUTIONS
for Question 5

(a)

Describe six varieties of network security service.

[6]
(b)

Which is the lowest OSI layer to provide:

(i) connection confidentiality?

(ii) connectionless confidentiality?

(iii) authentication?

(iv) connection integrity with recovery?

(v) non-repudiation?

 

[5]
(c)

Describe any four security services provided by the X400 electronic mail standard.

[4]