1. Table 1 shows scores given to 5 sessions by an intrusion detection system. The "True Label" column gives the ground truth (i.e., the type each session actually is). The intrusion detection used here is a signature-based matching system, so attack sessions are expected to have higher scores. Draw a ROC curve for the scores in Table 1. Clearly show how you calculated the ROC points. system Assume "Attack" as the positive ('p') class. Table 1. Intrusion detector's scores and corresponding “true" labels. 99 Session Score No. True Label 1 0.2 Normal 2 0.25 Attack 3 0.3 Attack 4 0.5 Normal 5 0.72 Attack

1. Table 1 shows scores given to 5 sessions by an intrusion detection system. The "True Label" column gives the ground truth (i.e., the type each session actually is). The intrusion detection used here is a signature-based matching system, so attack sessions are expected to have higher scores. Draw a ROC curve for the scores in Table 1. Clearly show how you calculated the ROC points. system Assume "Attack" as the positive ('p') class. Table 1. Intrusion detector's scores and corresponding “true" labels. 99 Session Score No. True Label 1 0.2 Normal 2 0.25 Attack 3 0.3 Attack 4 0.5 Normal 5 0.72 Attack

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