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The protocol was used in Silent Text. Silent Text was discontinued on September 28, 2015, when its features were merged into Silent Circle's encrypted voice calling application called Silent Phone. [16] At the same time, Silent Circle transitioned to using a protocol that uses the Double Ratchet Algorithm instead of SCIMP. [16] [21]
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]
The concept of an encrypted phone had long been an interest of Silent Circle founder and PGP creator, Phil Zimmerman.In a video on Blackphone's website, Zimmerman said, I had to wait for the rest of the technology infrastructure to catch up to make it possible to do secure telephony.
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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).
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Most Windows Phone 7.0 devices (excluding LG Optimus), Acer Stream/Liquid, ... Galaxy A7, Silent Circle Blackphone 2, Smartisan U1 (Nut), Sony Xperia M4 Aqua, ...
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related to: silent circle phone