Virtual Labs

In the storage covert channel simulation, how does the sender encode information?

a: By encrypting the data before transmission Explanation

Explanation

b: By modifying access control permissions Explanation

Explanation

c: By changing the state of a shared database resource Explanation

Explanation

d: By sending explicit messages to the receiver Explanation

Explanation

How does the receiver decode information in the storage covert channel?

a: By reading encrypted messages Explanation

Explanation

b: By observing the presence or absence of a shared resource Explanation

Explanation

c: By checking network traffic Explanation

Explanation

d: By analyzing access control rules Explanation

Explanation

What system behavior is exploited in a timing covert channel?

a: File permission changes Explanation

Explanation

b: Database record modification Explanation

Explanation

c: Variations in execution or response time Explanation

Explanation

d: Explicit message passing Explanation

Explanation

Why are timing covert channels difficult to detect in real systems?

a: They require special hardware Explanation

Explanation

b: They use encrypted communication Explanation

Explanation

c: Timing variations can naturally occur during normal operation Explanation

Explanation

d: They bypass authentication mechanisms Explanation

Explanation

What role do system logs play in this experiment?

a: They prevent covert channel attacks Explanation

Explanation

b: They encrypt transmitted data Explanation

Explanation

c: They help infer hidden data transmission by recording system behavior Explanation

Explanation

d: They replace access control mechanisms Explanation

Explanation

What conclusion can be drawn when a data transfer is blocked but information is still inferred?

a: Access control policies are unnecessary Explanation

Explanation

b: Encryption has failed Explanation

Explanation

c: Information leakage can occur through unintended system behavior Explanation

Explanation

d: The receiver bypassed authentication Explanation

Explanation

Covert Channels and Information Leakage