Schneier on Security

A blog covering security and security technology.

Schneier for TSA Administrator

It's been suggested. For the record, I don't want the job.

Since the election, the newspapers and Internet have been flooded with unsolicited advice for President-elect Barack Obama. I'll go ahead and add mine.

[...]

And by "revamp," I mean "start over." Most security experts agree that the rigmarole we go through at the airport is mere security theater, designed not to make us safer, but to make us feel safer by making it increasingly inconvenient to fly. TSA's approach to security is too reactionary -- too set on preventing attacks and attempted attacks that have already happened. And please, whatever you do, resist the temptation to let TSA workers unionize. Security from terror attacks should be a federal jobs program. You need the authority to fire underperforming screeners quickly and effortlessly. Three game-changing possibilities to head up TSA: security guru Bruce Schneier, Cato Institute security and technology scholar Jim Harper, or Ohio State University's John Mueller.

Although I'd be happy to see either Jim or John with it.

I don't want it because it's too narrow. I think the right thing for the government to do is to give the TSA a lot less money. I'd rather they defend against the broad threat of terrorism than focus on the narrow threat of airplane terrorism, and I'd rather they defend against the myriad of threats that face our society than focus on the singular threat of terrorism. But the head of the TSA can't have those opinions; he has to take the money he's given and perform the specific function he's assigned to perform. Not very much fun, really.

But I'd be happy to advise whoever Obama choses to head the TSA.

The job of the nation's CTO would be more interesting, but I don't think I want it, either. (Have you seen the screening process?)

Posted on November 18, 2008 at 1:46 PM • 27 Comments • View Blog Reactions

The Neuroscience of Cons

Fascinating:

The key to a con is not that you trust the conman, but that he shows he trusts you. Conmen ply their trade by appearing fragile or needing help, by seeming vulnerable. Because of THOMAS [The Human Oxytocin Mediated Attachment System], the human brain makes us feel good when we help others--this is the basis for attachment to family and friends and cooperation with strangers. "I need your help" is a potent stimulus for action.

This is interesting. They say that all cons rely on the mark's greed to work. But this short essay implies that greed is only a secondary factor.

Posted on November 18, 2008 at 6:32 AM • 24 Comments • View Blog Reactions

Most Spam Came from a Single Web Hosting Firm

Really:

Experts say the precipitous drop-off in spam comes from Internet providers unplugging McColo Corp., a hosting provider in Northern California that was the home base for machines responsible for coordinating the sending of roughly 75 percent of all spam each day.

Certainly this won't last:

Bhandari said he expects the spam volume to recover to normal levels in about a week, as the spam operations that were previously hosted at McColo move to a new home.

"We're seeing a slow recovery," Bhandari. "We fully expect this to recover completely, and to go into the highest ever spam period during the upcoming holiday season."

But with all the talk of massive botnets sending spam, it's interesting that most of it still comes from hosting services. You'd think this would make the job of detecting spam a lot easier.

Posted on November 17, 2008 at 5:11 AM • 24 Comments • View Blog Reactions

Friday Squid Blogging: Vintage Squid Can Labels

Mostly sardines, but some squid.

Posted on November 14, 2008 at 4:41 PM • 5 Comments • View Blog Reactions

Datamation Interview

Interview with me from Datamation.

Posted on November 14, 2008 at 12:52 PM • 5 Comments • View Blog Reactions

Me on Passwords

My Guardian article also appeared in The Hindu. Nothing I haven't said before.

Posted on November 14, 2008 at 12:47 PM • 18 Comments • View Blog Reactions

Reducing the Risk of Human Extinction

Not a threat people think a lot about.

Posted on November 14, 2008 at 6:06 AM • 44 Comments • View Blog Reactions

Giving Out Replacement Hotel Keys

It's a tough security trade-off. Guests lose their hotel room keys, and the hotel staff needs to be accommodating. But at the same time, they can't be giving out hotel room keys to anyone claiming to have lost one. Generally, hotels ask to see some ID before giving out a replacement key and, if the guest doesn't have his wallet with him, have someone walk to the room with the key and check their ID.

This normally works pretty well, but there's a court case in Brisbane right now about a hotel giving a room key to someone who ended up sexually attacking the woman who had rented the room.

In civil action launched yesterday, the woman alleges the man was given the spare access key to her room by a hotel staffer.

The article doesn't say what kind of authentication the hotel requested or received.

Posted on November 13, 2008 at 12:12 PM • 48 Comments • View Blog Reactions

Watching a Malware Author Work

Using the incremental update feature of pdf files to watch a malware author create his exploit.

Posted on November 13, 2008 at 6:04 AM • 6 Comments • View Blog Reactions

Censorship in Dubai

I was in Dubai last weekend for the World Economic Forum Summit on the Global Agenda. (I was on the "Future of the Internet" council; fellow council members Ethan Zuckerman and Jeff Jarvis have written about the event.)

As part of the United Arab Emirates, Dubai censors the Internet:

The government of the United Arab Emirates (UAE) pervasively filters Web sites that contain pornography or relate to alcohol and drug use, gay and lesbian issues, or online dating or gambling. Web-based applications and religious and political sites are also filtered, though less extensively. Additionally, legal controls limit free expression and behavior, restricting political discourse and dissent online.

More detail here.

What was interesting to me about how reasonable the execution of the policy was. Unlike some countries -- China for example -- that simply block objectionable content, the UAE displays a screen indicating that the URL has been blocked and offers information about its appeals process.

Posted on November 12, 2008 at 12:56 PM • 59 Comments • View Blog Reactions

The Economics of Spam

Excellent paper on the economics of spam. The authors infiltrated the Storm worm and monitored its doings.

After 26 days, and almost 350 million e-mail messages, only 28 sales resulted -- a conversion rate of well under 0.00001%. Of these, all but one were for male-enhancement products and the average purchase price was close to $100. Taken together, these conversions would have resulted in revenues of $2,731.88 -- a bit over $100 a day for the measurement period or $140 per day for periods when the campaign was active. However, our study interposed on only a small fraction of the overall Storm network -- we estimate roughly 1.5 percent based on the fraction of worker bots we proxy. Thus, the total daily revenue attributable to Storm's pharmacy campaign is likely closer to $7000 (or $9500 during periods of campaign activity). By the same logic, we estimate that Storm self-propagation campaigns can produce between 3500 and 8500 new bots per day.

Under the assumption that our measurements are representative over time (an admittedly dangerous assumption when dealing with such small samples), we can extrapolate that, were it sent continuously at the same rate, Storm-generated pharmaceutical spam would produce roughly 3.5 million dollars of revenue in a year. This number could be even higher if spam-advertised pharmacies experience repeat business. A bit less than "millions of dollars every day," but certainly a healthy enterprise.

Of course, the authors point out that it's dangerous to make these sorts of generalizations:

We would be the first to admit that these results represent a single data point and are not necessarily representative of spam as a whole. Different campaigns, using different tactics and marketing different products will undoubtedly produce different outcomes. Indeed, we caution strongly against researchers using the conversion rates we have measured for these Storm-based campaigns to justify assumptions in any other context.

Spam is all about economics. When sending junk mail costs a dollar in paper, list rental, and postage, a marketer needs a reasonable conversion rate to make the campaign worthwhile. When sending junk mail is almost free, a one in ten million conversion rate is acceptable.

News articles.

Posted on November 12, 2008 at 6:52 AM • 51 Comments • View Blog Reactions

Reading a Letter from the Envelope it Was In

Fascinating:

Paul Kelly and colleagues at Loughborough University found that a disulfur dinitride (S₂N₂) polymer turned exposed fingerprints brown, as the polymer reaction was initiated from the near-undetectable remaining residues.

Traces of inkjet printer ink can also initiate the polymer. The detection limit is so low that details of a printed letter previously in an envelope could be read off the inside of the envelope after being exposed to S₂N₂.

"A one-covers-all versatile system like this has obvious potential," says Kelly.

"This work has demonstrated that it is possible to obtain fingerprints from surfaces that hitherto have been considered extremely difficult, if not impossible, to obtain," says Colin Lewis, scientific advisor at the UK Ministry of Defence. "The method proposed has shown that this system could well provide capabilities which could significantly enhance the tools available to forensic scientists in the future."

Posted on November 11, 2008 at 7:55 AM • 25 Comments • View Blog Reactions

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