A new study by Internet security company McAfee has many parents on high alert. It shows 70 percent of teenagers hide what they're doing online and highlights the top 10 ways they are doing it.

Hiding the browsing history is one way teens cover online tracks. "Is it just hidden or is it completely deleted?" asks mother Lisa Rae.

"It's deleted," replied her son Anthony.

"Completely?"

Anthony showed Lisa how its done. He shows her a lot about computers, but sometimes it doesn't quite sink in. "You know that blank stare you'll get? I was talking to her about it like, last night. Something she doesn't know. She's just sitting there and she's like, okay, and she doesn't really respond, you know?"

Anthony is more of a computer enthusiast than most 16-year-olds. He's already created software and apps used by his Council Bluffs high school and hopes to enter the computer field some day. "I think it's really interesting to see how they work and how people interact with them."

For Lisa, trusting what Anthony does is key. "I think that parents always result to the last possible thing that you could be. So then they ruin their trust and they kind of get a little..." explained Anthony.

If teens were James Bond, the smart phone would be their secret weapon. "She would have no idea how to use mine like how I know how to use it, so I could very easily hide things from her," said Anthony.

One of the most popular teenage tricks, "You know you've seen those movies where the kids minimize the screen when their parents walk in."

Other ways teens hide what they're doing online on the McAfee list include hiding or deleting IMs or videos, lying about what they do online, using a computer parents don't check, using privacy settings to make certain content is only viewable by friends, using private browsing modes, creating email addresses unknown to parents and creating duplicate or fake social network profiles.

Rae says as long as parents keep on the information highway, there shouldn't be too many problems with safety and security online.

Internet security will play a larger role when it comes to teens like Anthony in Council Bluffs. This fall, every Council Bluffs high school student is getting a laptop.

"We're trying to provide something that is motivational and educational for students to keep them engaged and keep them focused on learning while they're at school and then give them the opportunity to extend the learning while they're at home," said Dave Fringer with Council Bluffs Community Schools.

The schools have a sophisticated security system to keep teens safe online when they're in class, but at home it's up to parents.

They are planning an orientation session before the laptops are given out to help students and parents learn the rules and responsibilities. Both students and parents will sign a loan agreement as well. The sessions run from the end of July to mid-August.