The SENA UD100 Bluetooth adapter, plus a slightly larger antenna, allows Blue Hydra to peer deep into the Bluetooth world. Sean Gallagher My new neighbor was using AirDrop to move some files from his phone to his iMac. I hadn’t introduced myself yet, but I already knew his name. Meanwhile, someone with a Pebble watch was walking past, and someone named “Johnny B” was idling at the stoplight at the corner in their Volkswagen Beetle, following directions from their Garmin Nuvi. Another person was using an Apple Pencil with their iPad at a nearby shop. And someone just turned on their Samsung smart television. I knew all this because each person advertised their presence wirelessly, either over “classic” Bluetooth or the newer Bluetooth Low Energy (BTLE) protocol—and I was running an open source tool called Blue Hydra , a project from the team at Pwnie Express . Blue Hydra is intended to give security professionals a way of tracking the presence of traditional Bluetooth, BTLE devices, and BTLE “iBeacon” proximity sensors. But it can also be connected to other tools to provide alerts on the presence of particular devices. Despite their “Low Energy” moniker, BTLE devices are constantly polling the world even while in “sleep” mode. And while they use randomized media access control (MAC) addresses, they advertise other data that is unique to each device, including a universally unique identifier (UUID). As a result, if you can tie a specific UUID to a device by other means, you can track the device and its owner. By using the Received Signal Strength Indication (RSSI), you can get a sense of how far away they are. Read 6 remaining paragraphs | Comments
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Hands-on: Blue Hydra can expose the all-too-unhidden world of Bluetooth
An anonymous reader quotes a report from Ars Technica: Researchers from MIT and the Masdar Institute of Science and Technology, led by George Ni, describe a prototype design that boils water under ambient sunlight. Central to their floating solar device is a “selective absorber” — a material that both absorbs the solar portion of the electromagnetic spectrum well and emits little back as infrared heat energy. For this, the researchers turn to a blue-black commercial coating commonly used in solar photovoltaic panels. The rest of the puzzle involves further minimizing heat loss from that absorber, either through convection of the air above it or conduction of heat into the water below the floating prototype. The construction of the device is surprisingly simple. At the bottom, there is a thick, 10-centimeter-diameter puck of polystyrene foam. That insulates the heating action from the water and makes the whole thing float. A cotton wick occupies a hole drilled through the foam, which is splayed and pinned down by a square of thin fabric on the top side. This ensures that the collected solar heat is being focused into a minute volume of water. The selective absorber coats a disc of copper that sits on top of the fabric. Slots cut in the copper allow water vapor from the wick to pass through. And the crowning piece of this technological achievement? Bubble wrap. It insulates the top side of the absorber, with slots cut through the plastic to let the water vapor out. Tests in the lab and on the MIT roof showed that, under ambient sunlight, the absorber warmed up to 100 degrees Celsius in about five minutes and started making steam. That’s a first. The study has been published in two separate Nature articles: “Steam by thermal concentration” and “Steam generation under one sun enabled by a floating structure with thermal concentration.” Read more of this story at Slashdot. 
An anonymous reader shares a Bloomberg article: German Chancellor Angela Merkel’s government reached a deal with automakers to jointly spend 1.2 billion euros ($1.4 billion) on incentives to boost sluggish electric-car sales. Buyers will be able to receive as much as 4, 000 euros in rebates to help offset the higher price of an electric vehicle, Finance Minister Wolfgang Schaeuble said at a press conference in Berlin. Purchasers of hybrid cars will get as much as 3, 000 euros off the price. The industry will shoulder 50 percent of the cost. The program is set to start in May, pending approval from the German parliament’s budget committee, he said. “The goal is to move forward as quickly as possible on electric vehicles, ” Schaeuble told reporters, adding that the aim is to begin offering the incentives next month. “With this, we are giving an impetus.” Read more of this story at Slashdot. 
