ZRTP
ZRTP was developed by Phil Zimmermann , with help from Bryce Wilcox-O'Hearn , Colin Plumb , Jon Callas and Alan Johnston and was submitted to the Internet Engineering Task Force ( IETF ) by Zimmermann , Callas and Johnston on March 5 , 2006 and published on April 11 , 2011 as . 
<triplet> ZRTP <subj> Phil Zimmermann <obj> developer