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[liberationtech] Ostel: encrypted phone calls

Nathan of Guardian nathan at guardianproject.info
Thu Feb 20 08:58:50 PST 2014


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On 02/20/2014 11:43 AM, KheOps wrote:
> I've tried a bit more Ostel.co, from a Linux machine. It seems to
> work pretty well, even though I should test it more thoroughly.

Glad to hear.

> I would like to suggest adding 'linphone' to the list of software
> that works for Linux on that page: https://ostel.co/about. I just
> tried it, it has support for ZRTP and is much lighter on the CPU
> and RAM than Jitsi.

We agree Linphone is a nice open-source solution, as well, and it does
include ZRTP on Linux and Android releases.

With the Android version, you need to manually turn on ZRTP and TLS in
the settings, so it isn't quite as "secure by default" as using the
OSTN or OStel wizard in CSipSimple.

However, the Android version has excellent video support, that works
through ZRTP encryption as well (though it is using a variable bit
rate codec, which can reduce the effectiveness of the encryption).

The iOS version unfortunately does not include ZRTP by default yet.

> 
> I cannot tell whether there has been any security review of
> linphone, though.

Nothing by us yet, though I am hopeful it can happen sometime this year.

+n



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