More info on the sealed sender functionality which is IMHO one of the main distinguishing feature of Signal: https://signal.org/blog/sealed-sender/ https://sign

More info on the sealed sender functionality which is IMHO one of the main distinguishing feature of Signal: https://signal.org/blog/sealed-sender/ https://signal.org/blog/sealed-sender/ Apart from that, group membership is also E2EE, which is a signifiant piece of metadata.