Don’t look now

Published 1/6/06

A new security hole has had folks in the IT industry scrambling lately — it’s a flaw in the way Windows handles a particular kind of image called a Windows Metafile, or WMF. Unlike JPEG images, which are used for detailed images such as photos (they’re called bitmap or raster graphics files), the WMF format is typically used for simpler images (it’s called a vector format).

Whatever. That’s not the point.

Apparently, if you even view an infected WMF file in, say, your e-mail or Web browser, your computer can be hit. Nasty.

And that reminded me of several wonderful stories by David Langford about “Basilisk” images. In short, these are images that, when viewed, overload the human mind to the point of killing a person.

The stories include “Blit,” “Different Kinds of Darkness,” “What Happened at Cambridge IV,” and — not exactly a story — the COMP.BASILISK FAQ.

They’re terrific reading. As you can see by the linked text above, “Blit” and the COMP. BASILISK FAQ are available free online. “Different Kinds of Darkness” was once as well; I’ll try to find a link.

*Neal Stephenson took the idea in a slightly different direction in Snow Crash, in which computer hackers’ minds were destroyed by viewing a particular piece of software.)

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The Fray


WILLOBIE says:

See also, the Zahir, a very short story by Jorge Luis Borges about an object that destroys the mind of the beholder. This link is a summary: http://www.acsu.buffalo.edu/~jatill/175/SUMZahir.htm

January 8th, 2006 at 1:24 PM

leal says:

tengo q leerlo para inglés y me parece bastante bonito pero es un puro coñazo al estar en ingles ya que se me dan bastante mal y me cuesta mucho entender lo que pone

April 19th, 2006 at 10:47 AM

Andrew says:

Unfortunately, I don’t think there’s a Spanish translation of either story, leal. And yes, I can appreciate that it would be hard to read without one!

April 19th, 2006 at 10:53 AM

Emily says:

Mr. Kantor:

I’m not a technology columnist and I dont’t play one on television, but I recognize when a format’s description has been edited to the point of absurdity. If, “That’s not the point”, then why bother misleading your audience?

I know you can hand code links to informative articles because I’ve seen you do it.

I wonder if Apple’s OS is susceptible to the same danger?

On the other hand, I loved Stephenson’s Snow Crash and appreciate the pointers to similar stories.

April 19th, 2006 at 1:57 PM

Andrew says:

I included the brief bit about WMF — that it’s a vector, not a bitmap format — as an explanation for people who had never heard of it, or were curious what it was.

I said “That’s not the point” because the point of the post was the danger, not the details about the format. But I often add bits of related information like that to give people a more-complete picture.

April 19th, 2006 at 2:22 PM

Emily says:

Had you limited your explanation to the vector vs. bitmap point, then no harm. However, the implication that the JPEG format is used for detailed images and the WMV format for simple ones is incorrect and more to your “point”, misleading. The potential danger of metafiles such as the WMV lies in the fact that they are composed of a series of commands that can, apparently, through your computer’s OS, not only direct the graphics hardware to produce a complex, scalable image, but wreak havoc with the system.

April 19th, 2006 at 2:56 PM

Emily says:

Sorry, that’s WMF.

April 19th, 2006 at 4:21 PM

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