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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Detection range of unintentional emissions by battery powered video recording devices?
I have read about unintentional radiators, but wonder about what their unwanted emissions detection range can be in low background noise, referring to battery powered motion-sensor activated video ...
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Why does a slightly out of specs power supply works and what are the possible consequences? [closed]
I have the following lamp:
Its power supply is rated at 5.6V and 2.68A blew up some time ago.
I then went to an electronics shop where I've been suggested that I could replace it by a universal power ...
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Thunderstorm reseting my micro-controller
I think this is a follow up from my previous question. If not then please ignore it.
I have created a very basic (crude) alarm system that uses a reed switch. Luckily there was a thunderstorm and some ...
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Can a USB key data be erased by a upsurge in the voltage?
Say I want to design a USB key that would hold personal information. And I want to have a kill switch that would make the NAND memories just destroy or change status instantly by an upsurge of voltage....
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Building a simple microphone jammer
A microphone jammer is a device that broadcasts ultrasound waves and, due to the non-linearity of mic amplifiers in small gadgets (i.e. smartphones) it overwhelms the microphone so the only sound the ...
user261126
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Simple security Alarm incorrect schematic diagram
I am a student and my Applied Physics teacher gave an assignment to create a schematic diagram of a security alarm. The main Components are,
Switch (Simple on/off)
SCR C106B (Silicon Controlled ...
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electric bedroom heated mattress vs danger
We have one 220v electric bedroom heated mattress which repaired by ordinary repairman and changed its board, the circuit is this kind:
And the burned spot in the Blanket:
Its used some resistor and ...
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How do I implement authentication on an embedded device? [closed]
I have been reading a lot about encryption lately but most sources just care about making sure that the connection between two parties is secure. I want to know how I can be sure that the party I am ...
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Problem with understanding the circuit related to stable matching security
I am trying to understand a circuit used for stable matching. The paper title is:
MPCircuits: Optimized Circuit Generation for Secure Multi-Party Computation and is available :
here
I am attaching the ...
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Hardware Secure Elements
After checking multiple suppliers and reading about HW secure elements, I would like to understand the use of this type of electronic components.
Maybe I´m wrong, but it seems a HW secure element ...
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Strategy against Side Channel Attack
I am newbie to Hardware Security. While studying Side Channel Attack, I realized that power consumption profile of electronic control unit is a key to encrypt what algorithm runs on it. I thought ...
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Secure storage of Data in external EEPROM
I am working in designing of a prepaid energy meter.
One of the most things I should store are (private key, credit and cumulative energy).
The private key is stored only once.
The credit and ...
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Protection against a circuit being closed too long or failing closed
I'm prototyping a device that allows me to electronically open my front door, which it accomplishes by using a relay to close an existing circuit in my house. All I know about this circuit is that it ...
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Side-channel leakage and instruction types on microcontrollers
Since the end of 90s, it is known that side-channels (e.g. execution time, power consumption, electromagnetic emanations) of computation platforms can be analysed to recover information on data being ...
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Can an Integrated Circuit ROM ever be secured [closed]
This presentation which includes embedding public asymmetric crypto assets in a micro-controller on chip ROM suggests that there are, but I am sceptical.
Is it the case that there is nothing that can ...
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What is the purpose of a mains X2 Security Capacitor and how to determine its value?
simulate this circuit – Schematic created using CircuitLab
I am evolving an existing circuit which has a 230VAC input.
The 230VAC has multiple loads:
Transformer followed by rectifing circuit;
...
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What receiver is appropriate for studying compromising emanations in 2019?
I'm currently reading the Cambridge Technical Report Number 577, Compromising emanations: eavesdropping risks of computer displays, by Markus G. Kuhn and published in Dec 2003. In the paper, Kuhn uses ...
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How to prevent someone clone PIC [closed]
ACT 1
Okay I know there is code protection system on PIC. But it is preventing someone read the code, not copy. It looks still easy to clone and run on another circuit. Can you suggest another ...
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Is POR Secure Memory/peripherals on ARM common in real hardware just a feature of QEMU?
I've been implementing firmware for an ARMv8 processor recently and have been studying open-source tools along the way. I looked into the ARM virtual model in QEMU and came across something it refers ...
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Modify Ring Contact Sensor in a series of wired security reed switches
After reading the instructables post on the simplisafe sensor I modified the ring sensor and tried to integrate it with my wired sensors. This is what I found:
testing with a spooled wire about 20 ...
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