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[liberationtech] PrivateSky Takedown

Yosem Companys companys at stanford.edu
Thu Dec 12 09:07:22 PST 2013


Certivox Asked That We Share Their Side of the Story on the PrivateSky Takedown.

YC



http://www.certivox.com/blog/bid/359788/The-real-story-on-the-PrivateSky-takedown

The real story on the PrivateSky takedown.

Posted by Brian Spector on Thu, Dec 12, 2013

With the story about our PrivateSky takedown now public, I want to
take the opportunity to clarify a few points in various articles that
have appeared since yesterday covering the story.

Some headlines strongly infer our friends at GCHQ "forced" us to take
PrivateSky down. That's not the case.

Secondly, a very important point wasn't printed. GCHQ couldn't, by
law, request a blanket back door on the system. There are a very rigid
set of controls that mean only specific individuals can come under
surveillance. The legal request for such surveillance has a due
process that must be stridently followed. At no time did I or anyone
at CertiVox talk about CertiVox in relation to any RIPA warrant, only
the generic process by which these warrants are served.

By saying "our friends at GCHQ", there is no facetiousness intended.
The team at CertiVox have the upmost respect for the folks we
interacted with at GCHQ. They took the due process I outlined in the
previous point very seriously. We found that as an organisation, and
every individual involved there, were as worried about a breach of
public trust as much as we are.

Finally, I believe very strongly the following should be a larger part
of the public discourse of these subjects. What everyone needs to
understand is that every developed democracy in the world, even where
privacy rights are enshrined to the maximum efficacy by statute, has
laws on the books that mandate that Internet Service Providers have
facilities to work with law enforcement for the purposes of legal
intercept, to enforce public safety and security.

Being L.I. capable is a very important set features and functions that
must be in place for any credible, commercial service on the Internet.
In endeavouring to make PrivateSky as secure as possible, we
overlooked this critical requirement when we built PrivateSky.

When CertiVox positioned PrivateSky as the easiest to use and most
secure encrypted messaging service, we really had two significant
points of differentiation. First, even though we held the root
encryption keys to the system, it was architected in such as way that
it would have been all but impossible for our internal staff to snoop
on our customer's communications, or for the service to leak any of
our customer¹s data. Secondly, our possession of the root keys, and
our use of identity based encryption, made the system incredibly easy
to use. For the user, there were no private or public keys to manage,
every workflow was handled for the user in an easy to grasp pure HTML5
interface, no hardware or software required, just an HTML5 browser.

We boxed ourselves into a feature set and market position that when
called upon to comply with legal statues, we simply had no alternative
but to shut the service down. We built it, but we couldn't host it.

Why? Because as you can probably surmise, there is an inherent
impedance mismatch between being able to host a commercial
communications service that gives the upmost in privacy to its users,
against any breach, whilst at the same time being able to operate
safely within the confines of the law as it is on the books in most
countries on the planet.

In summary, it's the abuse of the communications interception in the
Snowden revelations that has everyone up in arms, as so it should. But
that¹s not what happened with PrivateSky.

What is our next move?

Watch this space.



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