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Defcon 20 badges meld hieroglyphs, circuitry and cryptography for hacker scavenger hunt
Every year, the world's hacker population descends upon Las Vegas to trade notes, sit in on informational talks and compete in friendly contests -- all in the name of Defcon. But this time out, it's the conference's ever-evolving smart badges that've caught our eye, owing mostly to what lurks beneath. Designed by Ryan Clarke -- the mastermind behind the gathering's Mystery Box challenge -- these hackable IDs, issued according to status (Press, Human, Goons, vendors, etc), come embedded with an LED, a multi-core processor, IR transmitter and accompanying hieroglyphic graphic. But that's not all that makes these high-tech tags so special. Turns out, each one contains a game, buried within its open source software, that's encoded with several cryptographic, linguistic and mathematical layers. Shying away from hardware-focused hacks of the past, Clarke built this year's scavenger hunt-like game to be more inclusive of attendee skills, as it'll force conference-goers interested in cracking its code to break down social barriers and collaborate with other highly-specialized nerds. What's the end game, you ask? Well, according to Clarke, the puzzle is a continuation of last year's secret agent story (played out by a real-life actor) involving "a [mysterious] society of computer elites." It's not the sort of payoff we'd be after -- something greener and covered with a certain Ben Franklin's face would suffice -- but it sounds intriguing enough. Click on the source below to read more about the makings of this geek sport. And may the pastiest neckbeard win!
Researchers get CPUs and GPUs talking, boost PC performance by 20 percent
How do you fancy a 20 percent boost to your processor's performance? Research from the North Carolina State University claims to offer just that. Despite the emergence of fused architecture SoCs, the CPU and GPU cores typically still work independently. The University hoped that by assigning tasks based on each processor's abilities, performance efficiency would be increased. As the CPU and GPU can fetch data at comparable speeds, the researchers set the GPUs to execute the computational functions, while the CPUs did the prefetching. With that data ready in advance, the graphics processor unit has more resources free, yielding an average performance boost of 21.4 percent though it's unclear what metrics the researchers were using. Incidentally, the research was funded by AMD, so no prizes for guessing which chips we might see using the technique first.
Researchers boost multi-core CPU performance with better prefetching
Piling on cores is one way to boost performance, but it's not necessarily the most efficient way -- researchers at North Carolina State University have developed a new prefetching technique for processors that could boost performance by up to 40-percent. As you may know, any data not stored in a CPU's cache must be pulled from RAM, but as more cores are added they can create a bottleneck by competing for memory access. To counter this designers use prefetching to predict what information will be needed and grab it ahead of time, but guessing wrong can hurt performance. Researchers tackled this problem from two fronts: first, by creating a better algorithm for divvying up bandwidth, and second, by selectively turning off prefetching when it might slow the CPU. Full PR and an abstract of the study being published June 9th are after the break.
