Signal is available for iOS and Android and requires a phone number to get started. Signal taps into your address book, and you can then begin sending encrypted text messages and media, or call over Wi-Fi or cellular network.
When it comes to group messaging, Open Whisper claims "the Signal server never has access to any group metadata such as the membership list, group title, or group icon."
from Latest Topic for ZDNet in... http://ift.tt/2lyZM3a
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