Appears in the issue.

Silent Circle of National Har­bor, Maryland, offers the Silent Phone secure encrypted data communications service for Android and Apple iOS devices. The application enables secure video via smartphone over 3G, 4G, EDGE, and Wi-Fi networks. The custom-built Silent Network protects voice and video call data from interception and eavesdropping. It offers high-fidelity communications using the ZRTP peer-to-peer encryption protocol, which eliminates third-party encryption key management and tampering risks. Custom­ers download the app from Google Play or the App Store and create an account, which features a unique phone number for secure, end-to-end encrypted calls between any two subscrib­ers. With the Out-Circle Access option, encrypted calls can be made to regular phone lines.

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