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Questions tagged [security]

The tag has no usage guidance.

2
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3answers
201 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 ...
1
vote
2answers
68 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 ...
0
votes
0answers
86 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 ...
0
votes
0answers
41 views

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 ...
0
votes
0answers
58 views

Secure Web Server

Case and Problem: I have an esp32 board and reading through arduino's site, I don't see any streamlined ways of setting up a secure web server. I did see ways to securely connect to a remote host but ...
0
votes
1answer
54 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 ...
1
vote
1answer
78 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 -...
0
votes
2answers
63 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 ...
21
votes
4answers
3k 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 ...
0
votes
1answer
140 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 ...
1
vote
1answer
92 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 ...
0
votes
1answer
37 views

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.
0
votes
1answer
608 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 ...
0
votes
0answers
376 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 ...
2
votes
2answers
85 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 ...
0
votes
1answer
52 views

P Conductor E Conductor->PE Conductor

What are the difference between a P(Protection) Conductor and an E(Earthing) conductor.They combined make a PE conductor(Protective Earthing), but what are the difference between them separate?
0
votes
2answers
102 views

Magnetic Locks mods [closed]

What about magnetic locks? Two questions.. Does armature plate need be exact size as magnetic mate? Id like to get a bigger one milled so i dont have to use lasers to check perfect alignment. ...
0
votes
2answers
62 views

Wireless security for repetitive messages?

I'm designing myself a custom home automation system. Eventually, I want to expand the system to include security/alarm. The easiest way I know to do this is to include wireless capabilities. This ...
2
votes
1answer
525 views

Interfacing to End Of Line Resistor In Security System

Off the shelf security consoles utilize an end of line resistor to monitor the integrity of the cable runs, usually a 2 KOhm resistor. Is there a more or less standard interface circuit that most of ...
0
votes
2answers
137 views

Can any part of Intel's (RdRand) random number generator be visually inspected?

A random number instruction RdRand, has been added to Intel's Ivy Bridge processors that (allegedly) draws upon a hardware entropy circuit. The architecture is (allegedly) something like this:- The ...
0
votes
0answers
457 views

HTTPS (HTTP+SSL) server - field provisioning

My goal is secure field provisioning. Specifically, loading WiFi credentials on a device in the field. To do this, I wish to set up MCU as a WiFi Access Point with no WEP, WPA, etc - "open". The ...
0
votes
3answers
259 views

Controlling hardware with serial port [closed]

I initially posted this in SuperUser SE Site, but it was recommended that I bring it here instead. So, here we go :) We have a 'dated' security system at the office. It is a model that was made (or ...
13
votes
5answers
8k views

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 ...
0
votes
1answer
718 views

Learning about security of UART and RS232 [closed]

I'm trying to learn about UART and related problems and solutions. IIUC, UART is a hardware, RS232 is an interface and hyperterminal is a program. Would these parts be able to work together? I ...
8
votes
3answers
2k views

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 ...
-3
votes
1answer
101 views

Anti case violation system for embedded products

I'm developing an embedded system that contains critical information inside. When someone tries to violate the case to obtain access to the board, the system should detect it and erase all the data ...
2
votes
1answer
217 views

Is CDMA more secure than LTE or GSM?

I know this question is very direct but I was curious to know why in defense applications CDMA is being preferred over LTE. Is CDMA more secure than LTE & hence difficult to intercept?
2
votes
1answer
172 views

How secure are station clocks (using DCF77)? [closed]

In the Netherlands, we have clocks at train stations like on the one on the image below. In order to get the time as precise as possible, the clocks read the time from the DCF77 signal. (As far as I ...
3
votes
3answers
385 views

What security risks does the Test Access Port (TAP) introduce?

Trying to get my head around the JTAG world I looked at how the Test Access Port (TAP) works and although I get why we need it, the diagram seemed to me (as a software developer) introducing some kind ...
0
votes
1answer
170 views

Power supply safety standards

I want to build radio/alarm clock that power itself from the wall. I live in Canada. What safety standards should I follow? And is it free to acquire the datasheet of these safety standards or does it ...
-2
votes
2answers
669 views

FPGA: Reverse Engineer Design [closed]

I am looking to determine the plausibility of reverse engineering a design from an FPGA. Suppose a company fabricates their revolutionary design on FPGAs and I have managed to acquire one. My goal is ...
3
votes
1answer
472 views

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 ...
0
votes
1answer
287 views

Use a solar battery charging system to power day/night security camera?

I have in mind a wireless security camera but it still needs an AC adaper for power. I wish to supply this power from a 8 x 1.5v supply of 2,500 mAh batteries that are charged in daytime with 12 volt [...
3
votes
3answers
397 views

Plausable deniablity / steganography in radio transmission

Normally in a wartime scenario etc. strict radio silence is observed to prevent the enemy from evesdropping on your transmissions. Encryption solves a part of the problem. Now the enemy cannot ...
1
vote
3answers
1k views

Erasing Flash with X-rays to remove security bits

Scenario: A chip is read/write protected by programming a security bit in its onboard flash memory. Normally this would mean it cannot be re-written. Would a dose of X-rays be capable of erasing the ...
0
votes
1answer
64 views

grounding measurement methods

As long as I know the accepted methods for measuring the resistivity of electric grounding grids, once they are built, for any kind of building (in cities, at industrial level, transmission towers, ...
1
vote
1answer
64 views

Controller security

What is the general approach used by the military to safeguard controllers that fall into enemy hands? Let's say the controller needs to interpret radio / wireless signals to do it's job. But it ...
1
vote
1answer
155 views

How to ensure your MCU can't be reverse engineered?

I am building a project around an nRF51822 chip from Nordic, using the mbed prototyping platform. I would like to ensure that the code cannot be extracted / deduced from the project after it has been ...
1
vote
2answers
1k views

How do security alarm systems measure zone resistance?

Recent security alarm systems use EOL(R) or DEOL(R) to terminate the line of the zones. Question 1: What method is used to measure the resistance of a zone? I can think of two options: It measures ...
0
votes
1answer
282 views

8051 and SHA-1 implementation

I'm hoping to benchmark SHA-1 on a 8051 micro controller, so I'm looking for an efficient implementation of (HMAC) SHA-1 for the 8051. C or assembly works for me. Given the age of both SHA-1 and 8051, ...
10
votes
4answers
2k views

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 ...
5
votes
3answers
307 views

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 ...
0
votes
2answers
2k views

how to reverse a photoresistor

Ive made up a laser security sytem that uses a pnp and npn transistor. Everything is going well except for the LDR. When there is no light the led will stay off. And once there is light it will turn ...
0
votes
2answers
587 views

Is it possible to protect smart card from being copied?

I'm currently working on SLE4442 smart card. I'm trying to make a payment system. but the card has to be "copy-protected" what I mean here is that if that data on the card is copied as it's, this data ...
-2
votes
1answer
166 views

adam module sensing AC motion detector [closed]

I have been trying to setup a custom security system for my house. I am using Milestone's XProtect system with multiple cameras and one Adam 6050 module. I use the Adam 6050 module for magnetic door ...
4
votes
1answer
82 views

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 ...
0
votes
1answer
3k views

Cheapest way to get motion sensor to send SMS or email [closed]

I want to build some cheap security system in to cottage without electrical network. Burglars gets inside always by breaking the window. I think I would need some PIR or microwave sensor. Is there ...
1
vote
1answer
102 views

Read strings from ATmega or Arduino

I have found out that one can disassemble an ATmega with objdump or avrdude. And if the LB1 and LB2 bits are set low it would be much harder. So if these bits are set high or just reading the flash is ...
0
votes
1answer
549 views

Set LB1 and LB2 low on Arduino and ATmega

I have searched for a possibility to objdump microcontrollers. I then have found this post. There it says that LB1 and LB2 can be set to low to prevent the most people to read from it. My questions ...
1
vote
1answer
4k views

Creating a logic function of a burglar alarm system for a bank

This is the problem from homework that I am stuck on: A burglar alarm system for a bank is to be operative only if a master switch at the police station has been turned on. Subject to this ...