Worried about the NSA, the FBI, criminals or cyberspies electronically eavedropping on your private phone calls? There may be an untappable app for that.

On Tuesday, an independent hacker and security researcher who goes by the handle Moxie Marlinspike and his Pittsburgh-based startup Whisper Systems launched free public betas for two new privacy-focused programs on Google's Android mobile platform: RedPhone, a voice over Internet protocol (VoIP) program that encrypts phone calls, and TextSecure, an app for sending and receiving encrypted text messages and scrambling the messages stored in their inbox.

Marlinspike says the apps will interface with users' contact lists and other functions on the phone to take the hassle out of making calls and sending texts that can't be eavesdropped by third parties. "Our main aim is to make this as easy as possible," he says. "We want it to be a secure and anonymous drop-in replacement for the normal dialing system on your phone."

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