The outages faced by Delta, United and other airlines show what cyber-warfare might look like. A lack of a cyber-strategy could have dire consequences for physical infrastructure depending on the severity of the threat.
US-based internet provider, Dyn, suffered a series of cyber attacks which disrupted the ability to access popular websites such as Spotify and Twitter.
The Democratic Congressional Campaign Committee was the target of a "cyber security incident" just days after the Democratic National Committee faced a similar attack.
The cyber theft of $81 million from Bangladesh's Central Bank have led investigators to evidence left by unidentified hacking groups from North Korea, Pakistan and another country.
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