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Silent Phone: Encrypted voice calls, video calls and text messages on mobile devices. Currently available for iOS, Android, and Silent Circle’s Silent OS on Blackphone. It can be used with Wi-Fi, EDGE, 3G or 4G cellular anywhere in the world. [16]
In 2016, Silent Circle had significant financial problems, caused by a significant overestimate of how many phones they could sell. This led to the near bankruptcy of the company. [14] At some point in the 2010s, Silent Circle stopped selling blackphones, although they still offer privacy software intended for off-the-shelf phones. [15]
It was targeted at users who sought improved privacy and security. It provided encryption for phone calls, emails, texts, and internet browsing. PrivatOS was a modified version of Android, forked from Android 4.4.2, that came with a bundle of security-minded tools. [2] However, in contrast to Android, PrivatOS was not open source.
ZRTP ("Z" is a reference to its inventor, Zimmermann; "RTP" stands for Real-time Transport Protocol) [1] is described in the Internet Draft as a "key agreement protocol which performs Diffie–Hellman key exchange during call setup in-band in the Real-time Transport Protocol (RTP) media stream which has been established using some other signaling protocol such as Session Initiation Protocol (SIP).
AOL
The two worked together to trace the calls and found that a calling card was purchased at a Walmart in Panama City on April 9, 2004, hours before it was used to phone Mount Washington McDonald’s.
Zimmermann was born in Camden, New Jersey. [1] He received a B.S. degree in computer science from Florida Atlantic University in Boca Raton, Florida, in 1978. [2] In the 1980s, he worked in Boulder, Colorado, as a software engineer on the Nuclear Weapons Freeze Campaign as a military policy analyst. [3]
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