The Insider News

A Few Thoughts on Cryptographic Engineering[^]:

ZRTP has recently gotten some press for being the primary key agreement used by Silent Circle, a new encrypted voice/video/text service launched by PGP inventor Phil Zimmerman and some other bright folks. But it's also used in other secure VoIP solutions, like Zfone and Moxie's RedPhone. Silent Circle's an interesting case, since it's gotten some gentle criticism lately from a variety of folks -- well, mostly Nadim Kobeissi -- for being partially closed-source and for having received no real security audits.... It gives us a (wonky) chance to learn a little bit about this ZRTP protocol that so many people seem to be using.