Similar (I think) techniques were once used by Skype[1]. I wonder how much they&#x27;ve changed in the past few years.<p>1. <a href="https:&#x2F;&#x2F;www.blackhat.com&#x2F;presentations&#x2F;bh-europe-06&#x2F;bh-eu-06-biondi&#x2F;bh-eu-06-biondi-up.pdf" rel="nofollow">https:&#x2F;&#x2F;www.blackhat.com&#x2F;presentations&#x2F;bh-europe-06&#x2F;bh-eu-06...</a>