Questions tagged [security]

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37 views

How to properly implement a crowbar circuit to perform a fault injection / power glitch attack?

I am trying to implement a power glitch attack. This is a hardware attack in which for a very short period of time (order of nanoseconds) I remove the power to a processor, using a transistor, to ...
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1answer
92 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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1answer
74 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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1answer
45 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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1answer
46 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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1answer
88 views

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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2answers
111 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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1answer
69 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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3answers
246 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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2answers
84 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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1answer
1k 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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44 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 ...
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143 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 ...
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1answer
57 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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1answer
83 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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2answers
127 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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4answers
4k 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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1answer
151 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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1answer
98 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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1answer
43 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.
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1answer
611 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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0answers
522 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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2answers
86 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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1answer
104 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?
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2answers
109 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. ...
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2answers
63 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 ...
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1answer
639 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 ...
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2answers
169 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 ...
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464 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 ...
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3answers
315 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 ...
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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 ...
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1answer
831 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 ...
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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 ...
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1answer
103 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 ...
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1answer
259 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?
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1answer
195 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 ...
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3answers
489 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 ...
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1answer
191 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 ...
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2answers
753 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 ...
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1answer
634 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 ...
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1answer
291 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 [...
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3answers
427 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 ...
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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 ...
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1answer
65 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, ...
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1answer
69 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 ...
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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 ...
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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 ...
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1answer
302 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, ...
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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 ...
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3answers
315 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 ...