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JACKI LYDEN, HOST:

It sounds like something out of a spy movie.

(SOUNDBITE OF MOVIE, "SKYFALL")

RALPH FIENNES: (as Gareth Mallory) You lost the drive containing the identity of every agent embedded in terrorist organizations across the globe.

LYDEN: I bet James Bond wishes he'd burned those electronic files. And with the new iPhone app called Silent Circle, Agent 007 could've done just that. John Callas is one of the people who developed the app. He says the idea is pretty simple.

JON CALLAS: It's a timer. So you can say one hour, seven minutes - whatever.

LYDEN: It's called a burn notice. When the time's up, the text is erased from both the sender and the receiver's phones. Callas and his business partners got the idea after hearing an all-too-familiar story: A friend of theirs had inadvertently read a text meant for someone else.

CALLAS: The person who told us this said it made them think that this colleague of theirs was careless with the things that they were talking about in private; and said, couldn't you just make it so that when I send someone something, it only lasts for 10 or 15 minutes?

LYDEN: Well, they did it. For $20 a month, anyone with an iPhone or an Android can subscribe. They'll also encrypt your calls and texts so that they can't be hacked, tapped or otherwise tampered with. It works on video chats and documents, too, because Callas says our phones hold very personal data.

We do use texts, we use phone calls, for very intimate things that we don't want to have to justify later.

But what if the bad guys get the app? Some users may use the app to skirt the authorities, but Callas says that's not a reason to keep the technology from the rest of us. He says there are too many cases of law-abiding citizens being spied on.

CALLAS: It happens all the time. We've seen what went on with the News of the World scandals in the U.K. We've seen things nearly every few weeks, where there's some privacy scandal.

LYDEN: So John, I'm thinking that maybe you've gotten a phone call from the FBI, and they're not entirely happy about this?

Well, we have gotten phone calls from the FBI, and they said, oh, this is very interesting. How much is it? We'd like to think about...

(LAUGHTER)

CALLAS: We'd like to think about subscribing.

LYDEN: But outside of doing business, Silent Circle's leadership has emphatically said that they won't turn over any information to law enforcement. Some people think that agencies - like the FBI - won't ignore this app for long.

RYAN GALLAGHER: You know, it's the future of communication so they really have to respond, somehow.

LYDEN: That's Ryan Gallagher. He writes about surveillance and privacy issues for slate.com. He thinks governments will view apps like this as a security threat, and possibly try to regulate them.

GALLAGHER: I do think there will be some sort of backlash against this kind of technology because it's a kind of power struggle, and it's about control. And governments seem to always want more control. They don't want less control.

LYDEN: Right now, the customers are in control. As long as both parties have the app, any data sent between them will be secure. Silent Circle doesn't even have the keys that unlock the communications. Jon Callas says that's by design.

CALLAS: We are kind of like a department that takes sealed envelopes, and delivers them from one to another. We've made it so that we can't open up the envelopes. Only you and your partner can do that.

LYDEN: Silent Circle set up their service in Canada, a country with more privacy friendly laws than the U.S. So for now, at least, as long as you're in the circle, your information is silent and safe.

(SOUNDBITE OF MUSIC)

LYDEN: By the way, if you want to check out silentcircle.com, their visitor log is burned every seven days, so no one will ever know that you were there.

(SOUNDBITE OF MUSIC)

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