Boing Boing 

High-end CNC machines can't be moved without manufacturers' permission

On Practical Machinst, there's a fascinating thread about the manufacturer's lockdown on a high-priced, high-end Mori Seiki NV5000 A/40 CNC mill. The person who started the thread owns the machine outright, but has discovered that if he moves it at all, a GPS and gyro sensor package in the machine automatically shuts it down and will not allow it to restart until they receive a manufacturer's unlock code.

Effectively, this means that machinists' shops can't rearrange their very expensive, very large tools to improve their workflow from job to job without getting permission from the manufacturer (which can take a month!), even if their own the gear.

Read the rest

Art of Math (and vice versa)


125 Tetras

Carlo Séquin is a computer science professor and sculptor at UC Berkeley who explores the art of math, and the math of art. He lives in a world of impossible objects and mind-bending shapes. Séquin’s research has contributed to the pervasiveness of digital cameras and to a revolution in computer chip design. He has developed groundbreaking computer-aided design (CAD) tools for circuit designers, mechanical engineers, and architects. Meanwhile, his huge abstract sculptures have been exhibited around the world. Visiting the computer science professor emeritus’s office is like taking a trip down the rabbit hole. Paradoxical forms are found in every corner, piled on shelves, poised on pedestals, hanging from the ceiling—optical illusions embodied in paper, cardboard, plastic, and metal.

I wrote about Séquin for the new issue of California magazine and you can read it here: Sculpting Geometry

Capturing images of bystanders by zooming in on pictures of corneas

In Identifiable Images of Bystanders Extracted from Corneal Reflections, British psychology researchers Rob Jenkins and Christie Kerr show that recognizable images of the faces of unpictured bystanders can be captured from modern, high-resolution photography by zooming in on subjects' eyes to see the reflections in their corneas. The researchers asked experimental subjects to identify faces captured from these zoomed-in images and found that they were able to do so with a high degree of reliability.

The researchers used 39 megapixel cameras, substantially higher-rez than most people's phone-cameras, but low-cost cameras are making enormous leaps in resolution every day. What's more, the researchers suggest that the determining factor for identifying a face isn't resolution; it's having a viewer who is already familiar with the subject. It's an interesting wrinkle on the problem of information-leakage, and implies that future privacy-filters will have to scrub photos of reflective surfaces (especially eyes) of identifying faces before they're posted.

Read the rest

NSA drowning in overcollected data, can't do its job properly

NSA whistleblower William Binney warns that the agency collects so much useless information that it can't process it effectively. The Snowden leaks about the MUSCULAR surveillance program (tapping the fiber links connecting up the data-centers used by Internet giants like Google and Yahoo) corroborate Binney's view: in 2013, NSA analysts asked to be allowed to collect less data through MUSCULAR, because the "relatively small intelligence value it contains does not justify the sheer volume of collection."

Read the rest

Stross on Unix religion

Unix history: a religious perspective. (I like the idea of Linux as a Protestant Reformation: "a new, freely copyable kernel that all the faithful could read with their own eyes")

Deriving cryptographic keys by listening to CPUs' "coil whine"

In RSA Key Extraction via Low-Bandwidth Acoustic Cryptanalysis [PDF], a paper by Daniel Genkin and Eran Tromer of Tel Aviv University and Adi Shamir, the authors show that a sensitive microphone (such as the one in a compromised mobile phone) can be used to infer a secret cryptographic key being used by a nearby computer. The computer's processor emits different quiet sounds ("coil whine...caused by voltage regulation circuits") as it performs cryptographic operations, and these sounds, properly analyzed, can reveal the key.

It's a pretty stunning attack, the sort of thing that sounds like science fiction. But the researchers are unimpeachable (Shamir is the "S" in RSA), and their paper is very clear.

Read the rest

King James Programming: Markov chain trained on the Bible and a comp sci textbook

Michael Walker trained a Markov chain with the King James Bible and Structure and Interpretation of Computer Programs, a classic computer science textbook. The result is King James Programming, a tumblr filled with comp-sci-inflected biblespeak. I could read it all day long.

Read the rest

Kinematics: 4D printing for foldable, flexible forms

Jessica sez, "Kinematics is a system for 4D printing that creates complex, foldable forms composed of articulated modules. The system provides a way to turn any three-dimensional shape into a flexible structure using 3D printing. Kinematics combines computational geometry techniques with rigid body physics and customization. Practically, Kinematics allows us to take large objects and compress them down for 3D printing through simulation. It also enables the production of intricately patterned wearables that conform flexibly to the body."

Read the rest

badBIOS: airgap-jumping malware that may use ultrasonic networking to communicate

Security researcher Dragos Ruiu has been painstakingly untangling a weird, scary piece of malicious software that compromises the BIOS of the computers it attacks, allowing it to infect machines with different operating systems. He's dubbed it "badBIOS" and has seen it infect machines that aren't connected to the Internet. It appears that its initial vector may be a USB exploit, spreading by memory stick, but after that, it appears that it continues to communicate with other infected machines by ultrasonic networking through its hosts' mics and speakers (!). On Ars Technica, Dan Goodin has a deep dive into the strange, freaky world of badBIOS.

Read the rest

Black Perl, a poem in perl 3

Black Perl is a famous 1990 poem written in the programming language perl, by its creator Larry Wall. It is both a poem and a program, and runs under perl 3.

Read the rest

Implementing a Turing machine in Excel

Felienne describes how she, Daan van Berkel and some other friends went away for a weekend to hack a Turing machine out of Excel formulas. Lacking an infinitely long tape, they had to kludge around a bit, but the outcome is both cool and instructional (here's the machine itself). The Turing Machine is Alan Turing's "hypothetical device that manipulates symbols on a strip of tape," which formed the basis for modern, general-purpose computers.

Read the rest

Celebrate Software Freedom Day by hacking on STEED, a way to make email crypto easier

Georg sez, "End to end cryptography is one of the few truly effective ways in which privacy and security can be protected. GnuPG is the central tool for this, recommended and used by security icons such as Bruce Schneier. While the software itself is easier to use than most people realize, key exchange is cumbersome. The authors of GnuPG have developed a concept that will solve this issue: STEED. So this is a call to action for tomorrow's Software Freedom Day. Help spread the word so one of the biggest obstacles to pervasive end to end cryptography will be solved for good. Let the STEED run!"

Read the rest

Paranoid Browsing: anti-profiling plugin seeks feedback

Ben West read my novel Little Brother in tandem with the Edward Snowden leaks about NSA spying, and it got him thinking about a browser plugin called Paranoid Browsing to make it harder to profile your traffic based on surveillance. He's posted the source-code to GitHub and looking for critical feedback about the robustness of the system -- remember, the only experimental methodology for validating a security system is public discussion, because otherwise, you never know if your system is secure, or just secure against people who are stupider than you.

Read the rest

Unsupervised AI makes up some pretty funny jokes

Unsupervised joke generation from big data [PDF], a paper by University of Edinburgh researchers Sasa Petrovic and David Matthews, describes an ingenious and successful method for teaching a computer to make up jokes like "I like my relationships like I like my source, open;" "I like my coffee like I like my war, cold;" and "I like my boys like I like my sectors, bad." The researchers wrote code that called on Google's n-gram database to find noun-attribute pairs, zero in on nouns with ambiguous meaning, and automatically generate jokes.

Read the rest

Knitting as computation

K2G2 -- a wiki for "krafty knerds and geek girls" -- has a marvellous series of posts about "Computational Craft" through which traditional crafting practices, like knitting, are analyzed through the lens of computer science. The most recent post, A Computational Model of Knitting, point out the amazing parallels between knitting and computing, with knitting needles performing stack and dequeue operations, "While straight needles with caps store and retrieve their stitches according to the principle of LIFO (first in - last out), double pointed and circular needles additionally implement the functions of a queue or FIFO (first in – first out), effectively forming a double ended queue, also known as dequeue."

Read the rest