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[liberationtech] Open Secure Telephony Network (OSTN)

Nathan of Guardian nathan at
Sun Jul 15 06:52:13 PDT 2012

On 07/15/2012 09:44 AM, Jacob Appelbaum wrote:
>> Again: Is the source public? Have there been reviews/audits? Jake? :)

We've recently put up two posts as part of our overall efforts to
self-audit in a very public, transparent manner:

"A Network Analysis of Encrypted Voice over OSTN"

"Threats and Usability of Secure Voice"

You can also find the project wiki here, which includes all the research
we did into the various clients, servers, services, etc:

As for source code, you can find everything here:

Our full project tracker is also here, if you want to report bugs,
comment on features, or otherwise get involved:

It must be noted that OSTN is more an exercise in integration,
configuration and tuning, than outright software development from
scratch. All the pieces existed already to put the stack together
(CSipSimple for Android, and Freeswitch server), but they just needed a
bit more work on ensuring they worked together in a simple manner.

So in summary, eff ya there are audits, notes, code, reports, and
basically whatever else we can manage to put out there, in order to
build trust with our users and supporters.


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