While National Cyber Security Awareness Month may end on Halloween, Americans will likely remain terrified.

This week, Chapman University released a study that found that internet security is one of the top five fears that Americans sited. When it came to concerns rather than fears, Americans said that they were worried about identity theft on the internet, corporate surveillance on the internet and government surveillance on the internet — three of the five top concerns.

But unlike clowns and heights, Americans may have good reason to worry about internet security. A Pew Research study published this week in collaboration with Elon University surveyed 1,642 internet experts and more than half agreed that in the next decade, a major cyber attack would undermine national security, like damage and theft that costs tens of billions of dollars.

While their reasoning differed, the 1,000 who agreed that a catastrophic, online security breach was on its way reasoned that even as security improves, countermeasures to hack into the nation’s growing online infrastructure will also progress. They also pointed to recent cyber attacks and argued that security isn’t the top priority in online design.

Ten years ago, Pew Research conducted a similar survey on the future of the internet. Back then, 66 percent of the experts expected at least one devastating attack on the information infrastructure or power grid and 59 percent agreed that corporate and government surveillance would increase.