When it comes to preventing hackers from stealing private information, people usually pay more attention to software protection, such as installing firewalls, antivirus software, and amazingly making a hard drive physically encrypted.
However, hackers have taken a different approach and found the most hidden link in the hardware of our computer to carry out the attack-sound card. And the stroke rate is close to 100%!
Researchers at Ben Gurion University in Israel wrote a piece of code called "Speake (a) r", which will hijack the sound card after it is inserted into the computer. Even when the microphone is disabled, the headset and speaker can be used as hands Health equipment to monitor.
The researchers said that the realization of this strong method depends on a design flaw of Realtek audio chip. The current Realtek audio chip has a special function, which can reverse the signal output line into a signal input line under certain conditions. This function is indeed convenient for users, but also provides opportunities for hackers.
The researchers said that because almost all personal PCs are using Realtek audio chips (including motherboard integrated sound cards and independent sound cards), the scope of this defect is global. And because it is a defect at the hardware level, there is currently no good way to prevent attacks implemented with this technology, and we can only expect the next-generation Realtek audio chip to improve the design.
STC Series Three Phase Alternator
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This series generators are to be used in town, countryside, worksites, mountain and pasture as electric power source for lighting purpose, it can also he used as reserved power source for emergent case using.
The generators are of dripproof with rotary field type and adopt harmonic excitation system, easy operation and maintenance.
The generators are three-phase, four-wire type, adopting star connection with neutral point. The rated line voltage is 400V, phase voltage 230V, frequency 50Hz. power factor 0.8(lag). We can provide 60Hz and the other voltage's generator according to the customer's request.
They can be coupled with a prime mover directly or through v-belt making right or reverse continuous rotation at the rated speed. When the rotation speed of prime mover changs 3% or so and load varies in the range of 0~100% cos j 0.8~1.0, the generators offer constant voltage, when sudden change (increase or decrease) of load, the generator will soon return to their normal working state, at the same time, without any starting device the generator can directly start an unloaded squirrel cage induction motor.
Operating Condiyions:
Under the following environment, The generator could be continuous and rated running:
1.Above sea level: Not exceed 1000m
2.Cooling air temperature: 258~313K(-15 oC ~ 40 oC)
3.Relative air damping: not exceed 90%
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