Signal: app di messaggistica criptata. Sicura e open source. <span class="bsf-rt-reading-time"><span class="bsf-rt-display-label" prefix="Tempo di lettura"></span> <span class="bsf-rt-display-time" reading_time="2"></span> <span class="bsf-rt-display-postfix" postfix="min"></span></span><!-- .bsf-rt-reading-time -->