Questions tagged [security]

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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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0 votes
1 answer
72 views

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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10 votes
8 answers
2k views

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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1 vote
0 answers
45 views

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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0 answers
33 views

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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1 answer
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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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1 vote
2 answers
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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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3 votes
3 answers
1k views

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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2 votes
1 answer
104 views

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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1 answer
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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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0 votes
0 answers
31 views

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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10 votes
6 answers
962 views

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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0 answers
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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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49 votes
4 answers
9k views

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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3 votes
4 answers
2k views

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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0 votes
1 answer
100 views

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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2 votes
0 answers
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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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1 vote
3 answers
182 views

stm32h743 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 that only signed firmware will be allowed to be uploaded to ...
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3 votes
3 answers
277 views

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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2 answers
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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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1 answer
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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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-1 votes
1 answer
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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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2 votes
2 answers
1k views

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 ...
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0 votes
1 answer
245 views

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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1 answer
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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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1 vote
2 answers
178 views

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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0 votes
0 answers
52 views

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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2 votes
1 answer
75 views

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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1 vote
1 answer
108 views

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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1 vote
2 answers
365 views

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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0 votes
1 answer
72 views

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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1 vote
1 answer
48 views

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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1 answer
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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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0 votes
2 answers
3k views

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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1 vote
1 answer
83 views

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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2 votes
3 answers
598 views

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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1 vote
2 answers
120 views

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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0 votes
1 answer
3k views

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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0 answers
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Logic Style Level Vs Hardware Level

In the book: Advanced DPA Theory and Practice: Towards the Security Limits of Secure Embedded Circuits 1, it is explained that the countermeasures against Side-channel Cryptanalysis could be ensured ...
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  • 517
0 votes
1 answer
123 views

Reliable sensing method for device inside a parcel to detect when/if the parcel is opened?

I'm wracking my brain for reliable ways for an electronic device to detect when/if the parcel it is sealed inside is opened. The device will be sealed inside the package and activated via Bluetooth ...
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1 vote
1 answer
106 views

Wireless or wired solution for perimeter fence security?

We are currently working on a project where we would like to place around 350 vibration sensors on our university's perimeter fence for security. The field layout is almost 1km to 1km (square - 1km^2 -...
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1 vote
2 answers
372 views

Blow MSP430 security fuse with FET430 or MSP-FETFlash programmer

Is it possible to use a FET430, MSP-FETFlash or similar programmer to program and then blow the security fuse of the MSP430 devices? We have 500 which already been soldered on the boards and were ...
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24 votes
5 answers
5k views

Why are SRAM based FPGA used more than NVM based FPGA?

SRAM based FPGAs need to load the bitstream again after power off. Meanwhile the Non-Volatile based one don't need that. I wonder, why are more experiments and security research done on the SRAM ...
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  • 517
1 vote
1 answer
355 views

Protect Code inside Microcontroller [closed]

As a preface, what I am asking is highly related to this question. That said, the question linked was asked in 2011 (7 years ago), and I imagine the microcontroller world has changed (at least to ...
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2 votes
1 answer
121 views

What makes Smartfusion2 FPGA clamed as highly secure to ensure secure booting?

Is the FPGA Smatfusion2 claimed to be highly secure by its manufacturer (Microsemi, now Mircochip) because it is a non volatile memory FPGA? Meanwhile the SRAM FPGA like the zynq 7000 are considered ...
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0 votes
1 answer
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is it true that whether a POS can read an NFC card, that POS is compatible with HCE?

I was wondering if the host card emulation would produce the same result as an physical contactless card is producing.
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  • 103
0 votes
1 answer
623 views

One-time fuse for disconnecting/breaking signal path

I am looking for an IC solution, ideally, but alternatively also could use a tiny circuit that would allow to accomplish the following feature: Trigger an event by MCU that will fuse-out/disconnect ...
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  • 132
1 vote
0 answers
946 views

Connecting Protective Earth (PE) to DC ground

This question has a bit of application background so please bear with me: I'm working on a LED lighting system. The controller (MCU, led drivers and led supply) will be powered by a single DC ...
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2 votes
2 answers
91 views

Does the remote car door keyfob in today's automobiles change its code with every use?

I am just wondering why other keyfobs do not open my car door and thought every signal would have to be unique. So I did some research and they use a rolling code so in fact the code changes with ...
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