Customers who wait for Cyber Monday to go holiday shopping must be as wary as customers in brick-and-mortar stores and shopping malls, guarding sensitive personal information from Internet scams and hackers.

In the past year, one in four Americans were notified that their personally identifiable information — such as passwords, credit card numbers and email addresses — had been compromised, according to the National Cyber Security Alliance, or NCSA, and digital security company McAfee.