KEYCEO-Design, Manufacturing And Development Services Of OEM keyboard and mouse brands.
To simply put, there isn't any "one true secure method".Why, you might ask? Because computing has always been about trust, whether implicit or explicit. Regardless if it was the 1960's or today, you trust the machine in question to act like you expect. This can prove quite an issue, because potentially, you could be dealing with a software or hardware based keylogger, to a whole virtualized OS, which would have access to all the memory contents at any give time. There's no way a user could traverse a massive list every time they sat down at a computer. Somethings are simply impossible, such as verifying firmware on one of the many chips placed into the computing device.
The key part to understand is how much trust do I require? For some corporations and government agencies, this could be down to the firmware level, and expense isn't an issue. To a home user this could be software based keyloggers, and malware. To a researcher, it could prove to be "none" as they only expect to see a correct output from a simulation. The sophistication of the attack vector(s) in question are important, which is good to see you mentioned a school environment. It's common to see "monitoring tools" in school computer labs for whatever reason the IT staff, librarian, principal, and/or school board sees fit.
You can search the internet for common software, but most do include a software keylogger, hooks to the Windows API to retrieve all gui window titles, and take periodic screenshots. An on-screen keyboard is sufficient to guard against a spying librarian, as I remember back from my high school days. I even remember writing a program in Autoit to change the title of all active windows I had open to fool the monitoring software (that was from my mischievous days). The software my school used is linked below. A software keylogger and typical "off the shelf" monitoring software isn't going to log where you click on a screen, it's too much effort. Keepass with it's entry obfuscation can even deter spying users that deploy software keyloggers.
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How do I make a woly keyoard key stale again? closed
I"ve had to do this more times than I would like to rememer. It's very difficult to exlain ut I did find this as well as a video. See the ottom. Good luck to you!From Lato-keys.comHow to fix lato keyoard keys for the Dell Latitude D610If your Dell lato key is roken or missing, you have come to the right lace for all resources to fix or reair your lato keyoard key. Rather than sending hundereds of dollars on a new keyoard, you will find that relacement lato keys is cheaer and easier to do. Here, we will give a quick tutorial on how to relace the lato key on your Dell Latitude D610. This is a sulimental guide in addition to the video installation instructions aove on you to relace your Dell Latitude D610 keyoard key:Now, to install your new Dell Latitude D610 lato key, egin y orientating the retainer cli in the roer direction of the keyoard.
Typically, the small plastic feet on the plastic hinge will be spaced appropriately for you to determine which direction the plastic parts go in relation to the metal hooks on the keyboard base. Observe the laptop key retainer clips carefully and notice that the smoother side will always face up, additionally, the plastic feet on the laptop keyboard key retainer clip will always face downward to allow the hinge to fit into the metal hooks. Once the retainer clip is situated correctly, lock it into the metal hooks on the keyboard base, it is always easier approaching it from one direction and hooking in the plastic clip than another. If one direction does not work, try the other. Now the laptop key retainer clip will be securely attached and ready to accept the plastic key top.
If the laptop key is the type with the metal supporting bars, those will need to be inserted into the matching metal hooks as the laptop key cap slides over the plastic retainer clip and before it is pressed on. Once the keyboard key is positioned squarely over the retaining clip, press down gently until you hear a distinct click on all 4 corners. This indicates that the key cap has been secured to the retainer clip correctly. Pull up on all four corners gently to ensure that this happened correctly. That's it! You have successfully completed a repair on an individual key for the Dell Latitude D610 laptop key. .------
C# Arduino: How to detect if the needed software is present on the computer
How would i go about finding out if there is the needed driver on that computer where the digispark is plugged inI can't think of any way to do that. That's like asking if a keyboard you plug into a USB port can tell if you have Photoshop installed or not.Is there any way to add my program made in c# to the digispark .
..No. The Digispark is a tiny computer based on the Attiny85 which has 8k of program memory, some of which is dedicated to a bootloader which lets you upload new code.Your project is far too ambitious for the level of hardware you are proposing to use. In fact this video which I watched the other day comes to mind: youtube.
com/watch?vs7AXskSxxMkFrom a comment:the it refers to the digispark, when connected the digispark checks if the f17 key is pressed down and if it is that means my program is running in the background so use the functions that are compatible with the programOK, so you want the host computer (not the Digispark) to pretend it is holding down F17, and then when the Digispark is plugged in it checks if F17 is down, and if so it knows that the desired program is running on the PC. Is that your idea?The problem here is that the Digispark is a USB device (not a USB host). I suppose it would be possible to write a special device driver on the PC that, once the Digispark connects, would send some special code to say whether or not the program is running. However with the Digispark only having 8 KB of program memory, this extra code (on the Digispark) might be hard to fit in. Plus you would need to write your USB device driver. Plus the device driver would need to be able to query what programs are running.
I think a far simpler solution would be to have an On/Off button on the Digispark. If you plug it into a PC which has this special program running you press the button, then the Digispark sends the alternative commands to your C# program------
How are HIDs (keyboard,joypad) created and mapped?
When the Arduino sends data to the computer using the HID protocol it sends what is called a HID Report. That is basically an array of numbers in a pre-defined format that correspond to what the computer is expecting.In the case of keyboard events it sends a HID Keyboard ReportIt can send events for up to 6 keys at once along with up to 8 meta keys. How those key events are interpreted are down to the Keyboard Mapping used on the computer. This is the setting (usually in the Language or Regional settings of the computer) that defines the layout of your keyboard - UK, US, French "AZERTY", etc.While it is possible to create custom key mappings in many operating systems it is usually a very difficult and involved task. Also the mapping takes effect for every keyboard attached to the system, including the one you type on. So changing the mapping at will is probably not a good idea since it could break your normal keyboard usage.So how would you go about doing what you want to do? Well, my recommendation is not to do it on the computer, but to do it on the Arduino. The Arduino has multiple interfaces available at once. As well as the HID interface for keyboard and mouse it also has the CDC/ACM interface for emulating serial. You can use both of these at once quite happily. So you can use that USB serial interface to configure the way the Arduino works - including what key code to send for any particular event. You could even write an easy-to-use GUI in Visual Basic or something that communicates with the Arduino over serial to adjust the settings. How you do that communication (what protocol you come up with) is entirely up to you.
As for the hardware side of things - all you really need is just the switches / buttons and wire. Just follow the on-line tutorials (there's millions of them) for connecting switches and buttons to the Arduino. Enable the internal pullups, and connect the switch between the I/O pin and ground. For the rotary switch you will have 4 inputs and 1 output, so connect the 4 inputs to I/O pins and the 1 output to ground------
Apple II Plus modifier key doesnt work
Since the Apple II/II keyboard is based on a hardware encoder (AY-5-3600 (*1)), thus handling of Shift and CTRL is done by this chip. So any failure to recognize either modifier is most likely due the encoder or the keys themself.Having said that, there is a possible single point of failure for both modifiers: A 7400 on the little board below the keyboard. Two of its gates are used to invert and discriminate the modifiers, as they are not part of the matrix (like with a PC keyboard), but seperate inputs to the encoder. So if that IC is bad - or just out of place, both keys might work as if always enabled, or never - depending on the failure.First iteration (*2) here would be checking in- and output side of the IC at position U2 (*3). Pin #8 is the output signal for Shift and should go high when pressed, while pin #9 (shortened with #10) is the input from the key switch(es). Normaly at 5V, but going down to (almost) 0V when either Shift is pressed. Vor CRTL pin #11 is output (going high when pressed) and #12/#13 is input.
So when the signal seams fine after the gate, then the keyboard encoder might be dead. Bad luck as the are not realy common anymore. If not working there, but fine before the gate, it's the gate, and if not working there, it must be the keys.
There is another possible single point of failure, the connector between the two boards (PCB with keys and interface), but to affect all modifiers it would involve two connection pins (#3 & #24) broken on different ends of the SIL connector And at the same time no other damaged. Rather hard to imagine - and I can't see any hint on your picture.*1 - That's for the more common two pice keyboard like you have. If it's a real old II without a little secondary board, it's a different chip. MM-something, I don't remember.*2 - AFAIR it's direct soldered, without a socket. If it's socketed, the very first step would be just pressing it back into - giving every socketed IC a firm wellcome (press) is always a great idea when revitalizing an old machine.
*3 - just checked the schematics.