INFO 1016 Chap.1 Security Objectives, Assets and Trade-offs

Security Objectives, Assets and Trade-offs

Define confidentiality

The course material gives this chapter a concrete anchor: The opening topic teaches the CIA triad together with explicit trade-offs. That confidentiality anchor controls how integrity is explained and how availability is tested in changed practice.

Security Objectives, Assets and Trade-offs turns confidentiality, integrity and availability into executable reasoning.

The chapter's practical target is to prioritise security properties for a named system and consequence, so every explanation should connect syntax to program state, control flow and observable output.

Treat confidentiality as a precise program object, not a loose label. Identify the value or responsibility of confidentiality before execution, then trace what can read it, change it or depend on it.

This makes state changes visible before they become debugging guesses.

Use integrity to explain the program's next move. Work through one representative integrity input by hand and name the branch, iteration or call that follows. If the integrity trace cannot be stated, the code may run by accident rather than by understood design.

Bring in availability as the test of structure.

Compare normal, boundary and invalid inputs for availability; state the expected behaviour first; then use the mismatch between expectation and result to localise the defect.

For the application — prioritise security properties for a named system and consequence — write the smallest complete example that exposes the rule.

Explain why the availability result works, what would break it and how the program should signal or recover from that failure.

Trace integrity

Before running an example involving confidentiality, make a trace table with the important state before and after each operation.

Include the value associated with confidentiality, the control decision governed by integrity and the output or object affected by availability. The confidentiality table turns an unexplained result into a sequence that can be tested one transition at a time.

Test three inputs: an ordinary case, a boundary case and an invalid case.

State the expected availability result for each before execution, then compare it with what the program actually does. A useful test of integrity isolates one rule; changing several conditions at once cannot reveal which condition caused the failure.

Practise explaining the solution without reading the code.

For info1016, name the data representation, the control flow, the responsibility of each function or class and the reason the chosen design supports prioritise security properties for a named system and consequence.

This availability rehearsal matters when a written test or interview asks why the program works rather than whether it produces one correct output.

A complete response should make the task visible before the detail: identify what must be decided, define the relevant terms, connect the evidence to integrity, and use availability to test the result.

The final sentence about availability should answer the question actually asked rather than merely repeat the topic.

The controlling limit is specific: Maximum protection of one property can reduce another property or legitimate use.

Keep that availability limit beside the worked example, because it separates a careful info1016 answer from one that sounds confident but claims more than the task or evidence supports.

For revision, retrieve confidentiality, integrity and availability without notes, explain their relationship aloud, then complete a changed version of the application: prioritise security properties for a named system and consequence.

Record the first failed integrity reasoning move and repair it before attempting another case.

What this chapter covers

• 01

  confidentiality

• 02

  integrity

• 03

  availability

• 04

  Applying confidentiality

• 05

  Limits of integrity and availability

Secure a hospital schedule

Key terms

confidentiality

Protection against unauthorised disclosure. This chapter uses the concept when students prioritise security properties for a named system and consequence. Use this definition when the task is to prioritise security properties for a named system and consequence.

integrity

Protection of accuracy, completeness and authorised change. It helps explain the reasoning required to prioritise security properties for a named system and consequence. Use this definition when the task is to prioritise security properties for a named system and consequence.

availability

Reliable authorised access when needed. Its limit matters because maximum protection of one property can reduce another property or legitimate use. Use this definition when the task is to prioritise security properties for a named system and consequence.

Security Objectives, Assets and Trade-offs FAQ

Assessment move

Reconstruct the relationship among confidentiality, integrity and availability; complete the chapter application without notes; then test the result against this limit: Maximum protection of one property can reduce another property or legitimate use.

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