Federal officials defend new airport security measures in an attempt to calm outraged travelers who feel the stepped-up procedures are too invasive.

Some passengers and airline pilots' groups believe the full body scan used by the Transportation Security Administration is an invasion of privacy. The alternative, a pat-down by airport security that includes the groin area, is also believed to be excessive.

A man made headlines Monday after he refused both a pat-down and a full body scan when he tried to board a flight at the San Diego airport. Software engineer John Tyner posted a blog about what happened, which included video he took on his cell phone from the incident. (See AP video below) TSA workers refused to let Tyner on the plane.

Homeland Security Secretary Janet Napolitano said the procedures were necessary to ward off terrorist attacks.

"It's all about security," Napolitano said. "It's all about everybody recognizing their role."

The new procedures could make for longer lines during the holiday travel season.

Read more about the measures and Tyner here.