&gt; Are you in the right thread? The discussion here is about what information Google can get from GCM messages<p>The parent poster of the post you initially replied to asserted that Signal was &quot;giving NSA the only thing what they want: metadata from Google&quot;, so I guess that&#x27;s where tptacek is coming from.<p>On a side note, Google can&#x27;t actually know the message sizes because GCM is used without a payload.