Question one
a. Differentiate between encoding and enciphering. 4 marks
b. Compare secret key and public key encryption using five criteria. 8 marks
c. Differentiate between a cryptographer and crypto analyst. 4 marks
d. Give the properties of “trustworthy”encryption system. 4 marks

Question Two
a. Differentiate between the terminologies “fault”and “failure”as used in program
security. 3 marks
b. Define the term buffer overflow giving an example. 4 marks
c. The virus writer looks at some of the qualities appealing in a virus. List four of
these qualities. 4 marks
d. Explain about virus signatures. 2 marks
e. State the truths and misconceptions about viruses. 7 marks

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