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Announcing the first SHA1 collision

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The Google security blog carries the news of the first deliberately constructed SHA-1 hash collision. "We started by creating a PDF prefix specifically crafted to allow us to generate two documents with arbitrary distinct visual contents, but that would hash to the same SHA-1 digest. In building this theoretical attack in practice we had to overcome some new challenges. We then leveraged Google’s technical expertise and cloud infrastructure to compute the collision which is one of the largest computations ever completed." The SHA-1 era is truly coming to an end, even if most attackers lack access to the computing resources needed for this particular exploit.

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jepler
21 hours ago
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jepler
1 day ago
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hmmm is it a superpower if you can power your laptop from a cable that dangles vaguely from the crotch region?
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1 public comment
fxer
20 hours ago
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Girl power?
Bend, Oregon

Tales Of A Cheap Chinese Laser Cutter

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The star turn of most hackspaces and other community workshops is usually a laser cutter. An expensive and fiddly device that it makes much more sense to own collectively than to buy yourself.

This isn’t to say that laser cutters are outside the budget of the experimenter though, we’re all familiar with the inexpensive table-top machines from China. Blue and white boxes that can be yours for a few hundred dollars, and hold the promise of a real laser cutter on your table.

Owning one of these machines is not always smooth sailing though, because their construction and choice of components are often highly variable. A thorough check and often a session of fixing the non-functional parts is a must before first power-on.

[Extreme Electronics] bought one, and in a series of posts documented the process from unboxing to cutting. Starting with a full description of the machine and what to watch for out of the box, then a look at the software. A plugin for Corel Draw was supplied, along with a dubious copy of Corel Draw itself. Finally we see the machine in operation, and the process of finding the proper height for beam focus by cutting an inclined plane of acrylic.

The series rounds off with a list of useful links, and should make interesting reading for anyone, whether they are in the market for a cutter or not.

These cutters/engravers have featured here before many times. Among many others we’ve seen one working with the Mach3 CNC software, or another driven by a SmoothieBoard.


Filed under: laser hacks



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jepler
1 day ago
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it's the fiddly nature that puts me off of buying one of these. At $400 for the basic 40W CO2 laser cutter (last time I looked) it's a pretty good value proposition .. if it works consistently. but it won't. Maybe when word breaks that monoprice has come out with one that works surprisingly well at an astonishingly low price...?
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duerig
1 day ago
I worry about the electrical systems of a cheap laser cutter. A lot of current/voltage flows through the system.
sfrazer
15 hours ago
These concerns and an unwillingness to go too far into the weeds on troubleshooting is why I backed the GlowForge device. Of course 2.5 years later I'm still waiting....
duerig
15 hours ago
Haha. I was extremely tempted by the GlowForge pre-order. I might order one when they actually start shipping. Of course, the down side for me is that I may end up paying twice as much in exchange for avoiding the wait.
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NASA’s longshot bet on a revolutionary rocket may be about to pay off

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Ad Astra Rocket Company

HOUSTON—Franklin Chang-Díaz bounds up a handful of stairs and peers through a porthole cut into the side of a silver, tanker-truck-sized vacuum chamber. Inside, a blueish-purple light shines, unchanging and constant, like a bright flashlight. “It looks kind of boring,” Chang-Díaz admits. “But that plume is 3.5 million degrees. If you stuck your hand in that, it would be very bad.”

Truth be told, the plume does not look impressive at all. And yet the engine firing within the vacuum chamber is potentially revolutionary for two simple reasons: first, unlike gas-guzzling conventional rocket engines, it requires little fuel. And second, this engine might one day push spacecraft to velocities sufficient enough to open the Solar System to human exploration.

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jepler
1 day ago
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(plasma, not the one that needs imaginary^Wnew physics to work)
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jepler
1 day ago
https://en.wikipedia.org/wiki/Variable_Specific_Impulse_Magnetoplasma_Rocket
zipcube
1 day ago
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Dallas, Texas
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Samsung To Sell Refurbished Galaxy Note 7 With a Smaller Battery, Says Report

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According to a report via The Korean Economic Daily, Samsung is said to be putting refurbished Galaxy Note 7 handsets on sale with new batteries following the cancellation of the device late last year. The speculation suggests the smartphones could be relaunched this June. Android Authority reports: Samsung is said to be swapping the Note 7's 3,500 mAh batteries with a "3,000 to 3,200 mAh" batteries, according to The Korean Economic Daily's sources, predominately for sale in emerging markets such as India and Vietnam. The move is said to be part of Samsung's plan to recover costs from the initial device recall and avoid environmental penalties from the estimated 2.5 million or so Galaxy Note 7s it would have to dispose of. Samsung hasn't made any official announcements in this vein, but before the battery investigation concluded, a spokesperson did tell us that the company was: "Reviewing possible options that can minimize the environmental impact of the recall." Shifting refurbished units would certainly be one way to achieve that.
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jepler
2 days ago
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for anyone who never goes near an airport, it's a perfect deal...!
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Intel Supercharges Atom Chips With 16 Cores and Pro Level Features

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Agam Shah, writing for PCWorld: Intel's Atom was mostly known as a low-end chip for mobile devices that underperformed. That may not be the case anymore. The latest Atom C3000 chips announced on Tuesday have up to 16 cores and are more sophisticated than ever. The chips are made for storage arrays, networking equipment, and internet of things devices. The new chips have features found mostly in server chips, including networking, virtualization, and error correction features. [...] A surprising feature in C3000 is RAS (reliability, availability, and serviceability) capabilities, which is mostly found on high-end Xeon chips. The feature corrects data errors on the fly and prevents networking and storage equipment from crashing.
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jepler
2 days ago
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answering AMD's upcoming 8C/16T parts...
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jepler
1 day ago
.. but not really a very compelling one for the home user or workstation. Goldmont family lacks HT, so this is a 16C/16T part, and announced speeds are only up to 2.2GHz.
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