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Air gaps for critical systems remain an effective way to reduce the chance of attack. No connection to the web means threat actors have to be on-site to conduct operations. However, many companies are failing to ensure they are air-gapped. Over a third of industrial sites have at least one route to the internet. Search tools such as Shodan make it easier to find any devices not properly secured, giving attackers easy entry into industrial networks, and one is enough for attackers to get in.

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