{"id":1023905,"date":"2026-10-08T16:15:17","date_gmt":"2026-10-08T14:15:17","guid":{"rendered":"https:\/\/www.cias.it\/senza-categoria\/perimeter-security-fewer-nuisance-alarms-or-higher-detection-probability\/"},"modified":"2026-10-15T16:41:32","modified_gmt":"2026-10-15T14:41:32","slug":"better-fewer-nuisance-alarms-or-higher-detection-probability","status":"publish","type":"post","link":"https:\/\/www.cias.it\/en\/news\/better-fewer-nuisance-alarms-or-higher-detection-probability\/","title":{"rendered":"Perimeter Security: Fewer Nuisance Alarms or Higher Detection Probability?"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1023905\" class=\"elementor elementor-1023905 elementor-1023889\" data-elementor-post-type=\"post\">\n\t\t\t\t<div class=\"elementor-element elementor-element-9bc8a26 e-flex e-con-boxed e-con e-parent\" data-id=\"9bc8a26\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"vamtam-has-theme-widget-styles elementor-element elementor-element-b0bd18e elementor-widget elementor-widget-text-editor\" data-id=\"b0bd18e\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p data-pm-slice=\"1 1 []\"><strong>How do you measure the effectiveness of an intrusion detection system?<\/strong><\/p><br>Consider two perimeter security systems:<br><ul data-spread=\"false\">\r\n \t<li><strong>System A:<\/strong> generates one nuisance alarm per month.<\/li>\r\n \t<li><strong>System B:<\/strong> generates several nuisance alarms per week.<\/li>\r\n<\/ul><br><strong>Which system is more reliable?<\/strong><br><br>The answer is not as straightforward as it seems. One crucial parameter is missing: <strong>which system has a higher probability of detecting a real intrusion?<\/strong><br><br>This is the challenge every security system designer faces: finding the right balance between <strong>a high Probability of Detection (Pd)<\/strong> and <strong>a low Nuisance Alarm Rate (NAR)<\/strong>.<br><br><strong>The challenge?<\/strong><br><br>Increasing detection probability may also increase nuisance alarms, while reducing them too aggressively can compromise the system&#8217;s ability to identify genuine threats.<br><br><strong>An effective security system is not necessarily the one that generates the fewest alarms.<\/strong> It is the one that reliably detects real intrusions while keeping nuisance alarms within acceptable limits.<br><br>This balance is especially critical in <strong>perimeter intrusion detection systems (PIDS) protecting critical infrastructure<\/strong>, where an undetected intrusion could disrupt essential services such as electricity, gas, or water supply, potentially putting people&#8217;s safety at risk.<br><br><strong>Because in perimeter security, one additional nuisance alarm may be far preferable to a single undetected intrusion.<\/strong><br><br><em>(The second article in our series exploring detection quality and the design of modern security systems. By Courtesy of CIAS Sp z o o.)<\/em>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>How do you measure the effectiveness of an intrusion detection system? Consider two perimeter security systems: System A: generates one nuisance alarm per month. System B: generates several nuisance alarms per week. Which system is more reliable? The answer is not as straightforward as it seems. One crucial parameter is missing: which system has a&#8230;<\/p>\n","protected":false},"author":6,"featured_media":1023892,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[183],"tags":[],"class_list":["post-1023905","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/posts\/1023905","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/comments?post=1023905"}],"version-history":[{"count":2,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/posts\/1023905\/revisions"}],"predecessor-version":[{"id":1023917,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/posts\/1023905\/revisions\/1023917"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/media\/1023892"}],"wp:attachment":[{"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/media?parent=1023905"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/categories?post=1023905"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cias.it\/en\/wp-json\/wp\/v2\/tags?post=1023905"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}