Blogger: Dan Blum

It is no surprise for us to hear loose lips flapping in India about a capability to decrypt Blackberry and other carrier traffic.

After all, we’ve done basic threat analysis for years and it was only months ago that I was brought into a company-wide CISO meeting at a U.S. defense contractor to help them hash out their travel policy for mobile devices. Going into the meeting, I knew their policy restricted taking devices to a list of countries considered dangerous – but there was an exemption for BlackBerries.

Our research uncovered that BlackBerry is pretty secure in most respects. It has transport encryption along with optional password protection, remote kill, disk encryption, and S/MIME encryption. Viruses have not flourished on this functionally limited and closed platform. Few if any third party add on programs are required for additional protection. Nonetheless, I went into the meeting prepared to talk with the CISOs about the risks and security limitations of life on BlackBerry.

Was the BlackBerry exemption reasonable? At the time, BlackBerry transport encryption was not known to have been broken (to be fair, the article listed above still qualifies as rumor, not certainty of breakage). However, I pointed out that it is dangerous to assume well-equipped attackers like military or intelligence organizations can’t crack transport encryption. And even if they haven’t cracked the BlackBerry network and whole disk encryption features, sophisticated adversaries have other attack paths. Check out Neal Stephenson’s excellent book Cryptonomicon for a description of how a talented adversary might “see” your keystrokes and screen images through a motel room wall, for example.

If one of your employees – such as a key scientist, project manager, or executive – is targeted for surveillance and is carrying sensitive data through certain countries, one could argue that he or she had better undergo serious counter-intelligence training.  Learn to spot and shake tails, sneak into dark alleys for that BlackBerry fix. Learn to paper the closet with layers of aluminum foil and send messages in the dark. Defend that BlackBerry with encryption, long passphrases, and kung fu. But unless James Bond is running your company, I doubt this is what your executives have in mind for the next business trip!

Assuming your organization’s lower level employees are like needles in a haystack and won’t be bothered could be an exercise in wishful thinking. It is always possible that nation states are monitoring some or all of the airwaves. Not so long ago the NSA had a massive a covert surveillance program in place. Years before the government was reportedly snarfing up terabytes of emails and crunching them through a program called Carnivore. And of course, selective monitoring of people on watch lists continues on a large scale. This is just the surveillance we know about in the U.S. We suspect there’s more behind the scenes and especially in countries such as China. Even if you train your non-specifically-targeted low level employees to write and speak in search-keyword-free code, the carnivore programs of the world are pretty good at sniffing out those interesting needles – such as descriptions of your business plans, manufacturing processes, and trade secrets.

Sound paranoid? I admit that I don’t know what the probabilities of being targeted or monitored are – just that it can happen. It’s the height of arrogance to believe that a nation state can’t get your information if they’ve targeted it and you’re within their borders. And it’s dangerous to rely on security by obscurity when medium or high consequence information must be protected.

What can be done? If key personnel can't dispense with the BlackBerry (or any other email device) during international travel to those countries where information may be most at risk, they (the users) should limit communications to what they’d feel comfortable uttering over a potentially-monitored telephone call. Controlling incoming communications – messages sent by others – is a harder problem. Until data loss prevention (DLP) products become more contextually sensitive about the travel issues, it may be best not to synchronize the BlackBerry with the overseas user’s home mailbox. Instead, have the user give out a temporary address for the BlackBerry and warn senders to be discreet.

Cablevision will ultimately spend about $300m in building a Wi-Fi network exclusively for its customers; 2.4m of these customers qualify to use the service at no cost. There's no pay as you go option, no monthly subscription; you're either a subscriber of theirs, or not. It's a fascinating strategy, because they're leveraging all these dollars as a tool to crack its competitors in the market. With increasing competition from telephone companies that are offering television service, cable companies need to compete on voice, data, and video, as well as well as on mobile offerings. When the network is built, Cablevision can conceivably offer Wi-Fi telephony service, too.

I'm dying to know what the reduced churn rate and increase in subscriptions will be in six months. Given that hotspot access costs $10 to $30 per month depending on the network, Cablevision is delivering something of value. It's great honey for new subscribers and glue to keep current subscribers.

The company is claiming that with this latest activation, they have the largest Wi-Fi network for consumers in the U.S. They're likely correct. The only other public access network of scale that's being used by large numbers is in Minneapolis, and based on what I know about both networks, Cablevision probably deserves bragging rights. The network in Taipei, Taiwan, is likely still larger, but I haven't heard any usage number in nearly two years; at that point, subscription rates were 10 percent of what had been projected.

The Consumerist has the story:

WaMu’s crack fraud department is at it again, according to reader Kristin. Someone broke into her iTunes account and bought a couple hundred dollars worth of iTunes gift cards with her debit card information. She disputed the charge and WaMu told her not to worry — they’d take care of it. Two months later, while on a trip to Chicago, WaMu reversed the credits, causing Kristin to become severely overdrawn. No amount of protesting will convince WaMu that she wasn’t lying about the iTunes break-in. Why? Because she never responded to some mail they sent to her old address.

Yuck. Read the customer’s full account, and more information about the credit card fraud laws, in the full article.

An interesting blog post this morning discusses the obstacles and implications of this kind of technology, in part quoting a recent New York Times article —

In short, we need a log-on system that relies on cryptography, not mnemonics. As users, we would replace passwords with so-called information cards, icons on our screen that we select with a click to log on to a Web site. The click starts a handshake between machines that relies on hard-to-crack cryptographic code.

An obstacle to this kind of system are the current initiatives toward Open ID and single-sign on services, strategies that are backed by large industry players such as the Equifax, Google, Novell, Microsoft, Oracle, etc. In the open ID system, you would log in to a session on the web with one password, which would be accepted by any application/account supporting the open ID infrastructure.

To me Open ID sounds like a step backwards, toward less security…
then again, I would think that encrypting everything could also make your system run significantly slower, and that it wouldn’t prevent all the risks either…