Intrusion Detection Response Time Calculator
ANA›Life Services Authority›National Calculator Authority›Intrusion Detection Response Time Calculator
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Intrusion Detection Response Time Calculator
Calculate the total Intrusion Detection and Response Time (IDRT) by summing the time spent across each phase of the incident response lifecycle: detection, analysis, containment, and remediation.
Detection Time (minutes) — Time from intrusion occurrence to alert generation
Analysis Time (minutes) — Time to triage and confirm the alert as a true positive
Containment Time (minutes) — Time to isolate affected systems and stop the spread
Remediation Time (minutes) — Time to eradicate the threat and restore normal operations
False Positive Rate (%) — Percentage of alerts that are false positives (adds analyst overhead)
Avg. False Positive Investigation Time (minutes) — Time spent per false positive alert
Calculate
Results will appear here.
function intCalc() { var resultDiv = document.getElementById('int_result');
var detectionTime = parseFloat(document.getElementById('int_detection_time').value); var analysisTime = parseFloat(document.getElementById('int_analysis_time').value); var containmentTime = parseFloat(document.getElementById('int_containment_time').value); var remediationTime = parseFloat(document.getElementById('int_remediation_time').value); var fpRate = parseFloat(document.getElementById('int_false_positive_rate').value); var fpInvestTime = parseFloat(document.getElementById('int_avg_fp_investigation').value);
// Validation if (isNaN(detectionTime) || detectionTime Please enter a valid Detection Time (≥ 0).'; return; } if (isNaN(analysisTime) || analysisTime Please enter a valid Analysis Time (≥ 0).'; return; } if (isNaN(containmentTime) || containmentTime Please enter a valid Containment Time (≥ 0).'; return; } if (isNaN(remediationTime) || remediationTime Please enter a valid Remediation Time (≥ 0).'; return; } if (isNaN(fpRate) || fpRate = 100) { resultDiv.innerHTML = 'False Positive Rate must be between 0 and 99%.'; return; } if (isNaN(fpInvestTime) || fpInvestTime Please enter a valid False Positive Investigation Time (≥ 0).'; return; }
// Core IDRT formula: // IDRT = T_detection + T_analysis + T_containment + T_remediation var idrt = detectionTime + analysisTime + containmentTime + remediationTime;
// False Positive Overhead per true-positive incident: // FP_overhead = (FPR / (1 - FPR)) * T_fp_investigation // Interpretation: for every 1 true positive, there are FPR/(1-FPR) false positives investigated var fpRateFraction = fpRate / 100; var fpOverhead = 0; if (fpRateFraction > 0) { fpOverhead = (fpRateFraction / (1 - fpRateFraction)) * fpInvestTime; }
// Adjusted IDRT accounting for analyst time lost to false positives var adjustedIDRT = idrt + fpOverhead;
// Efficiency ratio: true-positive work vs total analyst time var efficiencyRatio = (idrt / (idrt + fpOverhead)) * 100;
// Convert to hours for readability var idrtHours = (idrt / 60).toFixed(2); var adjustedIDRTHours = (adjustedIDRT / 60).toFixed(2); var fpOverheadHours = (fpOverhead / 60).toFixed(2);
// MTTD and MTTR breakdown var mttd = detectionTime; var mttr = analysisTime + containmentTime + remediationTime;
var html = '### Results '; html += ''; html += 'MetricValue'; html += 'Mean Time to Detect (MTTD)' + mttd.toFixed(2) + ' min'; html += 'Mean Time to Respond (MTTR)' + mttr.toFixed(2) + ' min'; html += 'Core IDRT (MTTD + MTTR)' + idrt.toFixed(2) + ' min (' + idrtHours + ' hrs)'; html += 'False Positive Overhead per Incident' + fpOverhead.toFixed(2) + ' min (' + fpOverheadHours + ' hrs)'; html += 'Adjusted IDRT (with FP overhead)' + adjustedIDRT.toFixed(2) + ' min (' + adjustedIDRTHours + ' hrs)'; html += 'Analyst Efficiency Ratio' + efficiencyRatio.toFixed(1) + '%'; html += '';
// Severity classification based on adjusted IDRT var severity = ''; if (adjustedIDRT Excellent (≤30 min) — Meets real-time response benchmarks.'; } else if (adjustedIDRT Acceptable (30–120 min) — Within industry average; room for improvement.'; } else if (adjustedIDRT Below Average (2–8 hrs) — Consider automation and playbook improvements.'; } else { severity = 'Poor (>8 hrs) — High risk exposure; immediate process review recommended.'; } html += 'Assessment: ' + severity + '
';
resultDiv.innerHTML = html; }
#### Formulas Used
Core Intrusion Detection Response Time (IDRT):
IDRT = T_detection + T_analysis + T_containment + T_remediation
False Positive Overhead per True-Positive Incident:
FP_overhead = (FPR / (1 − FPR)) × T_fp_investigation Where FPR is the false positive rate as a decimal. This represents the expected analyst time wasted on false alerts for every real incident handled.
Adjusted IDRT:
Adjusted IDRT = IDRT + FP_overhead
Analyst Efficiency Ratio:
Efficiency (%) = (IDRT / Adjusted IDRT) × 100
Component Definitions:
- MTTD (Mean Time to Detect) = T_detection
- MTTR (Mean Time to Respond) = T_analysis + T_containment + T_remediation
#### Assumptions & References
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