The issue focused on computer hardware that monitors electronic devices for hackers. Computer experts say hackers could hack computers by observing how software updates work and gaining access to servers where passwords are stored.

Many websites including Amazon, eBay and PayPal now require users to enter passwords before logging in. Other sites such as Netflix have automated systems that automatically scan websites for infected machines and warn users if they come across malware.

Meanwhile, cyber criminals also developed technology that enabled them to bypass internet routers and browsers that monitor traffic for hackers