April 1999
SC223: COMPUTER SECURITY

QUESTION 5

Total Marks: 20 Marks

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SAMPLE STUDENT'S SOLUTIONS
for Question 5

 
(a) Describe the application of digital signatures as a means for authentication.

 

 [4]
(b) Describe two characteristics which are common to digital and written signatures.

 

 [4]
(c) Describe two benefits of using one-way hash functions in signing documents with public key cryptography.

 

 [4]
(d) Distinguish between symmetric and asymmetric key protocols.

 

 [4]
(e) Explain how authentication and secret transmission using the same algorithm could cause a security problem. [4]