Booking your hotel room online, buying souvenirs at a little shop or using your credit card to pay for lunch. When you’re traveling, almost anything you do can make you vulnerable to a data breach and possibly pave the way for identity theft.

“Nothing is impenetrable,” says Jerry Irvine, chief information officer at the IT outsourcer Prescient Solutions, and a member of the National Cyber Security Partnership. “If someone is going to hack into you, they can hack into you.”