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<p>that the device's IP address accessed a Signal server to send or receive messages at certain times.</p>

<p><big>Usage</big></p>
<p>Open Whisper Systems first introduced the protocol in application <a href="page.php?w=TextSecure">TextSecure</a>. They later merged an encrypted voice call application named <a href="page.php?w=RedPhone">RedPhone</a> into TextSecure and renamed it <a href="page.php?w=Signal_%28messaging_app%29">''Signal''</a>.</p>

<p>In November 2014, Open Whisper Systems announced a partnership with <a href="page.php?w=WhatsApp">WhatsApp</a></p><p>
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