On 23.05.2013 11:22, Eugen Leitl wrote:
> Considering that Google is dropping XMPP support, I'm investigating
> other options, e.g. Jitsi. Has there been a security review for
> Jitsi?

Not that I know.

https://jitsi.org/Main/Features

"Call encryption with SRTP and ZRTP for XMPP and SIP"
"Call encryption with SRTP and SDES for XMPP and SIP"

http://www.linphone.org/eng/features/

"Supports SRTP and zRTP"

http://mumble.sourceforge.net/FAQ#Is_Mumble_encrypted.3F

"The so-called control channel, which transports your chat messages and
other non-time critical information, is encrypted with TLS using 256 bit
AES-SHA. The voice channel carrying speech and positional audio is
encrypted with OCB-AES 128 bit. You and the server authenticate to each
other using digital certificates like they are used for secured
connections in Web-browsers."
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