A secure telephone is a telephone that provides voice security in the form of end-to-end encryption for the telephone call, and in some cases also the mutual authentication of the call parties, protecting them against a man-in-the-middle attack. Concerns about massive growth of telephone tapping incidents lead to growing demand for secure telephones. Additionally, as the popularity of VoIP grows, secure telephony is becoming more of commonplace and less the lonely domain of spies and civil libertarians.
The Daily Omnivore 
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