The New Zealand stock exchange (NZX) fell victim to repeated distributed denial-of-service (DDoS) attacks last week and earlier this week. This is a common cyberattack tactic in which a server or network is taken down by an avalanche of traffic.

It overwhelms the mark, so the resource or service is inaccessible to users. This can be mere mischief, or a distraction from another, more directed hack, or — as was the reportedly case with NZX — a ransom scheme...

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