Dutch Government Cybersecurity 2020:
"Quick detection can limit consequences, but in general it takes a long time. Detecting attacks early is a basic measure. The sooner the better. However, that remains a complex task for many organizations."
"According to a study, the average detection time of an attack in 2019 was 56 days. This average detection time is disproportionate to the speed with which an attacker can reach his target. It only takes a few hours. The annual report states that actors are quick to abuse. of published vulnerabilities. Even when the attacker is looking for less success, for example for espionage, rapid detection can limit the damage."
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