Questions tagged [security]
The security tag has no usage guidance.
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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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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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Is it possible to jam wireless home alarm systems?
Sorry if this is the wrong community for this question but in my mind, it's the best fit. Please close or move to a more appropriate community if it's off topic.
The other day, several home alarm ...
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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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Would an electric fence be able to detect being bypassed?
In the Flashpoint episode "The Farm," there's a scene where you can see one of the officers run a jumper cable from one contact on an electric fence to another, then cut the line of the fence (not ...
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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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securely storing and using keys in an embedded system
I'm using a microprocessor - PIC32MZ2048efm144 MCU that receives commands encrypted with a specific key, decrypts them and executes the command.
The encrypted commands are stored offline, so I cannot ...
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Is there a way to prevent code being read from an MSP430 without blowing the fuse?
I was recently involved at a project in a small company where we had fears of someone taking the code from the master chip, an MSP430F2419, and using it for a competing product. We ended up blowing ...
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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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Examples of DRM on embedded systems
I'm tasked with implementing a DRM on an embedded system. The device would have a limited number of times which it can run, after which it would be disabled, until it syncs with a computer with an ...
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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 it possible to read erased flash memory?
In hard disks, a "quick format" does nothing to the actual data on the disk - just clears the FAT (file allocation table), which then appears as a "blank disk" to the user. Therefore, it is fairly ...
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Large exponentials and 8-bit PIC processors
Does anyone know if 8-bit (PIC) processors could typically handle large exponentials, e.g., 5^15 mod 23, with a reasonable speed? Does doing so result in more ...
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How to save electronic equipment from ants? [closed]
Today I brought out my external HDD and it was full of red ants. It took me an hour to remove the ants (it seems quite impossible to remove all of them; some are still inside). I always see some ants ...
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How can I embed SmartCard/certificate challenge functionality in an embedded project?
I want to enable secure communication by embedding a certificate chip for a PKI in my embedded system so I can sign outgoing messages and make certificate challenges. I was expecting that there exist ...
