Ostel

Ostel.co secure VoIP network partners with Open Hosting

December 3, 2013

Ostel.co began as a R&D effort sponsored by The Guardian Project. The question: Is a peer-to-peer secure voice and video call network possible to …

VoIP security architecture in brief

November 21, 2013

Voice over IP (VoIP) has been around for a long time. It’s ubiquitous in homes, data centers and carrier networks. Despite this ubiquity, security is …

Jitsi, ostel.co and ISP censorship

July 22, 2013

Earlier last week n8fr8 suspected something changed on the ostel.co server, due to many users emailing support specifically about Jitsi connectivity …

Carrier Grade, Verizon and the NSA

June 12, 2013

Last week Glenn Greenwald at The Guardian broke the news that Verizon has been providing the NSA with metadata about all of the calls over a …

Lower Bounds of The Narrow Bands

February 22, 2013

Voice is becoming a standard feature of any messaging app on mobile phones, in various forms using many different protocols. There’s the old guard, …

Threats and Usability of Secure Voice

July 10, 2012

In my previous post I found that end-to-end encryption with OSTN is both effective and usable. There are two important things the user must be aware …

A Network Analysis of Encrypted Voice over OSTN

July 5, 2012

Introduction to OSTN The OSTN network stands for Open Source Telephony Network. It is a federated network standard for supporting Internet calling …

<!--:en-->OSTN secure VoIP wizard now built into CSipSimple for Android<!--:-->

May 26, 2012

If you saw our last post about how to setup your own secure voice-over-IP server instance, then this news is for you. If you are an Android user …

Singing and Dancing for Encryption

April 19, 2012

If you see me dancing or singing with my phone in my hand, I may not just be having a great time, but also creating an encryption key. Part of the …