Questions tagged [security]
The security tag has no usage guidance.
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How can a designer be sure to authorize only legit ICs? How is performed? How are cloned ICs prevented to be activated?
The above diagram is from the IC Activation (locking/unlocking) slide of Fighting against theft, cloning and counterfeiting of integrated circuits by Lilian Bossuet Associate Professor, CNRS Chaire of ...
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Switch ELECTRICALLY SAFE between 3 resistive loads (16 A each) on a 16 A line
How to switch 3 resistive consumers (heaters), each having a current consumption of nearly 16 A alternate & ELECTRICALLY SAFELY (German standards)?
So that only one of them heats at a time and the ...
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BLE relay to control my garage door - security concerns
I would like to use Shelly 1PM Mini Gen3 to control my garage door. Since I do not have WiFi coverage in my garage I will rely on Bluetooth. However with this setup I am not sure if this Smart home ...
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How can I make an alarm circuit which senses both cutting and shorting the wire?
I have searched Google top to bottom the only circuit which fullfills my requirements is a wire break or wire loop security alarm as shown in figure 1. I soon realised that if the robber shorts the ...
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ESP32 and security
I'm wondering how secured an ESP32 is.
I'd like to use one to read data on a Telnet device which should remain in an offline network for security purposes.
The ESP32 uses an Ethernet connection to ...
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Is there a (legal) wireless transmission solution for my underground parkade anti-theft alarm?
I live on the 4th floor of a low-rise condo building with a concrete parkade beneath. We have a serious problem with bicycle theft -- someone is coming in late at night with an angle grinder, and ...
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Best way to use Driveay alert output (Open Collector NPN)
I'm learning as I go on this project.
I have a beam-break driveway alert that I would like to get the output from on a device like an Arduino or Raspberry Pi and need some guidance on the best ...
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how to determine what chip wire allows BIOS flashing?
how to determine what chip wire/leg allows BIOS flashing?
I want to modify my MOBO to deny BIOS flashing.
I only want it allowed when I really need to write on it.
So, I need to know:
if it is ...
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How safe is it to plug a resistor on a 12 V transformer?
I was thinking about using an old fridge as a seedling cabinet. I am tempted to use the resistor of an out of order pizza oven plugged on a small 12 V transformer to heat the cabinet.
I didn't do the ...
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Securing PCB from illegal redistribution [closed]
I'm wondering if there is a state of the art method for securing a PCB with a microcontroller against copy and illegal distribution.
For example the well known the flight controller SP racing F3 had ...
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How safe is this and should I change it?
I just finished building a project in my house to automate two plugs I installed on the top of my table, but due to laziness I left the ground connections outside the junction box like in the image:
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In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m?
In this circuit, the light intensity sensor (LDR) only senses 3_2 cm. How can I improve the sensitivity of this sensor to reach 1m?
https://ibb.co/c3X1NRS
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Circuit board inside a charging cable
I am looking for help identifying a circuit board found inside one of the ends of a charging cable that mysteriously showed up on the desk in my home office. The board has the following stamped on it:
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What is the ideal method of sensing whether 4 points on the bottom of a device are all depressed to indicate contact?
I am trying to place a sensor or switch on each corner of some desktop PCs so that if they are lifted an event is triggered like locking the computer or encrypting it.
So far I have considered small ...
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Has any implementation succeeded to have shared key inside chipset and protect it from exploits?
Since there is a lot of demonstration like using SEM (Scanning Electron Microscope) to read bits from ROM through the scanned image of chipset, is there any implementation that has managed to succeed ...
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How to add more lights and sirens to motion detector
I have a motion detector size of a cigarette box that rings bell or simple song when activated using a small remote control. We turn it on after closing the business to go home. We've had many ...
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Breaker with alarm
I am thinking about a theft alarm for an HVAC condenser. The condenser is installed outside and subject to burglary. I think a viable approach is detecting when it is detached from power.
The HVAC ...
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Pin-based security chips for Arduino?
These cryptocurrency wallets like Coldcard can be unlocked by a simple PIN, and are fairly safe. I believe that they use a security chip that stores information and only delivers with the right PIN. ...
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How do I protect the power supply from a short circuit inside a device?
I'm working on an electronics project which would be powered by a 12V power adapter.
I'm worried that in a case of a short circuit inside the device I'm making, the adapter could catch fire. Every ...
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Security device for camera sensor?
I am currently designing a raspberry pi interface board and while I was looking at the documentation for MIPI CSI camera ports I bumped into this sentence:
Camera sensors supported by the official ...
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LS7220 passcode IC
I bought the LS7220 IC which is designed to check passcodes.
For some reason, the pin 8 Lock Status Output does not illuminate the LED when I connect the power, and when I bridge the VCC in sequence ...
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LS7220 IC question for HIGH and LOW
I am learning about the basics of electronics.
I bought an LS7220 chip for a keypad lock, but using it turned out more difficult than I expected. I have attached it to a 9v battery at pins 9 and 14, ...
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A few questions on PIRs and other motion detectors
I grew up incorrectly believing that motion detectors (as part of burglar alarm systems) were designed to detect movement, when in actual fact it is the movement of a heated (like body heat) object ...
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Why does Intel's CCA (USB3 JTAG control scheme) not let a remote attacker own any system with a flash drive plugged in?
JTAG lets us read / write the architecture states on a CPU core. Intel's CCA let's us connect to JTAG with a USB3 port. So why could an attacker not execute code to trick a flash drive plugged into a ...
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Why do fire and security systems run at 27.6 V?
I have been looking at buying power supply units for a project, and I keep seeing supplies that output 27.6 V. It's an unusually specific number, so what they are used for, and why is it important ...
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Reverse engineer this old burglar alarm panel
I took apart an old magnetic door alarm, where when the contact is broken it counts down from 10 seconds for the user to input the code (which ranges from 1 to 8, there is no 0 or 9 key). This alarm ...
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GFCI outlet vs centralized differential circuit breakers
In North America, I'm told GFCI outlets have become common. They have an individual differential circuit breaker built-in.
In the European Community, differential circuit breaker are (mandatorily) ...
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Randomize PCB trace generation with Altium Designer
We are trying to create a tamper mesh as a flex PCB. This tamper mesh will consist of around 10 signal traces in order to detect a tamper.
One crucial point is that this tamper mesh should be ...
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SRM32H743 signed DFU updates
I want to implement signed software updates to my MCU. It is connected via USB and I am using the USB DFU to upload a firmware to it.
I want only signed firmware to be allowed to be uploaded to the ...
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how to make an obfuscated network cable
(EDIT): forest for the trees
This is why I love StackExchange! I have several great ideas to try, none of which were my original.
I asked here based on an assumption I probably shouldn't make: my ...
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