Trust in Encrypted Voice: ZRTP

ZRTP is in many ways similar to OTR, in that it changes for every conversation, protecting the history of your communications. ZRTP is the standard in fully encrypted voice calls (using Jitsi, RedPhone, or Silent Circle). It requires you to read aloud a short series of characters to the person you’re speaking with in order to authenticate the call using your voice in combination with these unique characters.

Resources

  •    https://jitsi.org/Documentation/ZrtpFAQ#faqHow
  •    https://silentcircle.com/web/faq-zrtp/?#7