Wallpaper varnish. simple recipes

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FACTORY TECHNOLOGIES AT HOME - SIMPLE RECIPES
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Wallpaper varnish. Simple recipes and tips

Factory technologies - simple recipes

Directory / Factory technology at home - simple recipes

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To prepare wallpaper varnish, 2 parts borax, 2 parts shellac, 24 parts hot water dissolve. To be able to wash the wallpaper with soap and water without damaging the pattern and paints, they are pre-coated several times with this varnish. Then, after each spreading and drying, the wallpaper is rubbed with a soft brush until a shine appears on them.

Author: Korolev V.A.

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You can disrupt the operation of the HDD with the sound of ordinary speakers 30.05.2018

Security researchers at the University of Michigan in the US and Zhejiang University in China have been investigating acoustic attacks that can cause hard drive mechanics to fail and, as a result, damage both hardware and software. The attack does not require special equipment: an attacker can use conventional built-in speakers or connected acoustics to cause permanent errors in the target system.

"Our experiments have shown that audible sound causes the head stack assembly (HSA) to vibrate more than operating standards allow; and ultrasonic noise causes false alarms of the shock sensor, which is designed to prevent head failure. The identified problem can create great difficulties for magnetic hard drives, which are still very common in security-critical applications such as medical devices and other heavily used systems," the researchers said.

Modern mechanical hard drives use sensor-based proactive controllers to adjust the position of the hard drive head. Using ultrasonic vibrations, an attacker can cause false alarms, leading to head parking. Audible signals can also cause the read/write head to vibrate, resulting in poor positioning over the magnetic surface and operation outside of normal parameters. The hard drive will not function as intended by the manufacturer, which can damage both the drive itself and the files stored on it.

"An attacker can attack a hard drive by causing vibration through acoustic emitters built into the victim system (or the closest one to it) ... The attack will be more likely to be successful, the more powerful or physically closer the sound emitter is to the target drive," the statement says. research.

Using this type of attack requires the hacker to have access to nearby speakers. This is obviously problematic, especially for remote attacks. However, the researchers note that something similar can be done with even the simplest phishing attack or otherwise execute malicious JavaScript code on the victim's computer that would play harmful sounds through the system's speakers.

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