

"Defending the last missing pixels: Phil Zimmermann speaks out on encryption, privacy, and avoiding a surveillance state".

The company's products enable encrypted mobile phone calls, text messaging, and video chat. However, as of August 2020, the page for the secure messaging scorecard states that it is out of date and should not be used in privacy- and security-related decision-making.
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They received points for having communications encrypted in transit, having communications encrypted with keys the providers don't have access to ( end-to-end encryption), making it possible for users to independently verify their correspondent's identities, having past communications secure if the keys are stolen ( forward secrecy), having their code open to independent review ( open source), having their security designs well-documented, and having recent independent security audits. In November 2014, Silent Phone and Silent Text received top scores on the Electronic Frontier Foundation's secure messaging scorecard, along with " ChatSecure + Orbot", Cryptocat, TextSecure, and " Signal / RedPhone". Shortly after Smith became CEO, the company moved back from Switzerland to the United States. At the same time Tony Cole, VP and Global Government CTO of FireEye, was named to the Board of Directors. In January 2017 Gregg Smith was named CEO with a renewed focus on serving the large business space as well as Government entities. In March 2015 there was a controversy when Information Security specialist and hacker Khalil Sehnaoui identified that Silent Circle's warrant canary had been removed from their site. Blackphone and Silent Circle patched the vulnerability shortly after it had been disclosed.

A potential attacker only needed to know the target’s Silent Circle ID number or phone number. In January 2015, Silent Text had a serious vulnerability that allowed an attacker to remotely take control of a Blackphone device. On August 9, 2013, through their website, Silent Circle announced that the Silent Mail service would be shut down, because the company could "see the writing on the wall" and felt it was not possible to sufficiently secure email data with the looming threat of government compulsion and precedent set by the Lavabit shutdown the day before. The company was founded in the Caribbean island of Nevis, but moved its headquarters to Le Grand-Saconnex near Geneva, Switzerland in 2014 in search of a country with "stronger privacy laws to protect its customers' information."

Janke brought in security expert Vic Hyder, and the founding team was established. Zimmermann agreed to the project and called Jon Callas, co-founder of PGP Corporation and Vincent Moscaritolo. In November 2011, Mike Janke called Phil Zimmermann with an idea for a new kind of private, secure version of Skype.
