VoIP and Direct Connection Phones
As the popularity of VoIP grows, secure telephony is becoming more widely used. Many major hardware and software providers offer it as a standard feature at no extra cost.
Examples include the Gizmo5 and Twinkle. Both of the former work with offerings from the founder of PGP, Phil Zimmermann, and his VoIP secure protocol, ZRTP. ZRTP is implemented in Ripcord Networks product SecurePC with up to NSA Suite B compliant Elliptic Curve math libraries. ZRTP is also being made available for mobile GSM CSD as a new standard for non-VoIP secure calls.
Several manufacturers of hardware analog telephony adapters offer easy-to-use secure options.
The U.S. National Security Agency is developing a secure phone based on Google's Android called Fishbowl.
Read more about this topic: Secure Telephone
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