Another hot performer was Palo Alto Networks, a maker of firewalls and other security technologies, whose shares soared 26 percent on the first day of trading in July.

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Being able to rigorously enforce firewalls, authentication procedures and other security measures across the network is essential to the future security of the sea services.

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"Commonly available cyber defences such as firewalls, antivirus and automatic updates for security patches can reduce risk, but they're not enough, " wrote Mr Charney.

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