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CS507 - Information Systems - Lecture Handout 29

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Security of Information System

The information systems are vulnerable to modification, intrusion or malfunctioning. Hence they need to be secured from all these threats be devising a sound security system.

“Information assets are secure when the expected losses that will occur from threats eventuating over sometime are at an acceptable level.”

Security Issues

Some losses will inevitably occur in all environments. So eliminating all possible losses is either impossible or too costly. Level of losses should be specified. The level of losses decided should be linked with a time period in which the occurrence would be tolerated. The definition mentions threats, which can be either

CS606 - Compiler Construction - Lecture Handout 44

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Example: let us apply the algorithm to the following segment of 3-address code:

a = b + c
t1 = a * a
b = t1 + a
c = t1 * b
t2 = c + b
a = t2 + t2

Read more: CS606 - Compiler Construction - Lecture Handout 44