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Battery breakthrough: Double performance lithium battery that doesn’t catch fire

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Article URL: https://news.umich.edu/battery-breakthrough-doubling-performance-with-lithium-metal-that-doesnt-catch-fire/

Comments URL: https://news.ycombinator.com/item?id=17774978

Points: 186

# Comments: 64

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Sjon
18 hours ago
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24-core CPU and I can’t type an email

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Article URL: https://randomascii.wordpress.com/2018/08/16/24-core-cpu-and-i-cant-type-an-email-part-one/

Comments URL: https://news.ycombinator.com/item?id=17780127

Points: 169

# Comments: 53

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Sjon
21 hours ago
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Intel’s SGX blown wide open by, you guessed it, a speculative execution attack

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Foreshadow explained in a video.

Another day, another speculative execution-based attack. Data protected by Intel's SGX—data that's meant to be protected even from a malicious or hacked kernel—can be read by an attacker thanks to leaks enabled by speculative execution.

Since publication of the Spectre and Meltdown attacks in January this year, security researchers have been taking a close look at speculative execution and the implications it has for security. All high-speed processors today perform speculative execution: they assume certain things (a register will contain a particular value, a branch will go a particular way) and perform calculations on the basis of those assumptions. It's an important design feature of these chips that's essential to their performance, and it has been for 20 years.

But Meltdown and Spectre showed that speculative execution has security implications. Meltdown (on most Intel and some ARM processors) allows user applications to read the contents of kernel memory. Spectre (on most Intel, AMD, and ARM chips) can be used to attack software sandboxes used for JavaScript in browsers and, under the right conditions, can allow kernel memory or hypervisor memory to be read. In the months since they were first publicized, we've seen new variants: speculative store bypass, speculative buffer overflows, and even a remotely exploitable version of Spectre.

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Sjon
2 days ago
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The tech industry's use of persuasive techniques on children

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Article URL: https://medium.com/@richardnfreed/the-tech-industrys-psychological-war-on-kids-c452870464ce

Comments URL: https://news.ycombinator.com/item?id=17750959

Points: 167

# Comments: 118

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Sjon
3 days ago
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Security theater meets DEF CON as room searches spark controversy

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Enlarge / This sign is an invitation for a room search at some Las Vegas hotels. (credit: Getty Images)

In the wake of the mass shooting in Las Vegas in October of 2017, hotels in the city started drafting more aggressive policies regarding security. Just as Caesars Entertainment was rolling out its new security policies, the company ran head on into DEF CON—an event with privacy tightly linked to its culture.

The resulting clash of worlds—especially at Caesars Palace, the hotel where much of DEF CON was held—left some attendees feeling violated, harassed, or abused, and that exploded onto Twitter this past weekend.

Caesars began rolling out a new security policy in February that mandated room searches when staff had not had access to rooms for over 24 hours. Caesars has been mostly tolerant of the idiosyncratic behavior of the DEF CON community, but it's not clear that the company prepared security staff for dealing with the sorts of things they would find in the rooms of DEF CON attendees. Soldering irons and other gear were seized, and some attendees reported being intimidated by security staff.

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Sjon
3 days ago
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1 public comment
JayM
4 days ago
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*sigh*
Atlanta, GA

If you put chalk under a powerful microscope

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Article URL: https://twitter.com/ferrisjabr/status/1022534132415356928

Comments URL: https://news.ycombinator.com/item?id=17635247

Points: 341

# Comments: 67

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Sjon
4 days ago
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