PHILADELPHIA (CBS) — A growing number of teens are using secret apps to hide inappropriate photos and videos.

One of the apps is called “Calculator With A Percentage Sign.”

It looks like a calculator, but it’s a hidden vault allowing teens to hide images they do not want their parents to see.

Arkansas Attorney General Leslie Rutledge says, “Go to the app store on the smartphone and search the word “secret.” By searching that word, parents will learn quickly that there are a number of apps that their children can hide pictures, videos, photographs, any number of items from them using something as innocent looking as a calculator.”

She adds, “The best way to educate your children on the internet is to educate yourself.”

Experts say having a conversation with your child about the internet is the best thing to do.