The worldwide security appliance market continued on a growth trajectory in the first half of 2015, according to International Data Corp. (IDC).

The firm’s Worldwide Quarterly Security Appliance Tracker shows that both factory revenues and unit shipments rose in the first half. Worldwide vendor revenues increased 9.6% year over year to $4.9 billion, and volume shipments grew to 1.1 million and increased 8.8% year over year.

For the second quarter of 2015, worldwide vendor revenues increased 12.2% year over year to $2.6 billion, marking the 23rd consecutive quarter of revenue growth, IDC says. Shipments grew 10.6% year over year.

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Due in part to its higher threat profile, the United States market continued to be the largest market for security appliances, accounting for 41% of worldwide revenues in the second quarter with 17.8% year-over-year growth.

"Cybercrime remains a growing global problem and attacks against mission-critical and sensitive services or systems that leads to massive data leaks continue to have far-reaching effects,” Ebenezer Obeng-Nyarkoh, senior research analyst, Worldwide Trackers Group at IDC, said in a statement.

“Because there are so many ingenious ways into a network, having sophisticated cyber security measures is not the end game of a defensive prevention strategy," Obeng-Nyarkoh said. "The key is faster identification and prevention and this is why in the last seven consecutive quarters the deployment of intrusion detection and prevention solutions have been gaining traction.”

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