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Information about locks themselves. Questions, tips and lock diagram information should be posted here.
Moderators: zeke79, keysman
 by jhl » Mon Feb 26, 2007 1:46 pm
mh wrote:Currently I'm playing around with the Texas Instruments MSP430 microprocessor - they have a $20+shipping starter kit, it's the size of a USB stick, and it might very well work fine as a key. At the same time that processor has very little power consumption, and would probably work with a standard CR2032 lithium cell for quite a long time.
Using the RSA enc/decryption algorithm (for a public/private style system) could be the way to go. The question is if a reasonable length (1024 bits) of key can be manipulated with small, power efficient hardware.
I've had a quick squiz at the specs of some of the ATtiny micros, they look promising - very very very low power in standby mode, pretty low on as well. Not sure if 1Mhz@8bit is going to hack a 1024 bit key in reasonable time though. Let us know how you get on with the MSP430.
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jhl
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by mh » Mon Feb 26, 2007 3:45 pm
jhl wrote:I've had a quick squiz at the specs of some of the ATtiny micros, they look promising - very very very low power in standby mode, pretty low on as well. Not sure if 1Mhz@8bit is going to hack a 1024 bit key in reasonable time though. Let us know how you get on with the MSP430.
The ATtiny is a direct competitor of the MSP430, it would probably have quite similar features -
one question would be the initial setup cost for a hobby developer - I didn't find anything comparable to the $20 TI offer - do you know of something similar for the ATtiny?
Cheers,
mh "The techs discovered that German locks were particularly difficult" - Robert Wallace, H. Keith Melton w. Henry R. Schlesinger, Spycraft: The secret history of the CIA's spytechs from communism to Al-Qaeda (New York: Dutton, 2008), p. 210
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mh
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by jhl » Mon Feb 26, 2007 5:14 pm
Any small micro available in DIP can be breadboarded... surface mount chips can be, but it's somewhat hairier. Most common micros are cheaply available in small quantities, you'd need to build a programmer too.
All considered the TI deal is pretty good, though...
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by TOWCH » Sat Jan 10, 2009 3:13 pm
mh: What was your eventual conclusion on the MSP430? If you think it's got the balls I can start trying to learn to program for it. Trying to translate AES or Serpent or whatever in to Assembly sounds like the math may be over my head, but I'm willing to try. http://linux.softpedia.com/get/System/E ... 3630.shtmlEmulator for it BTW.
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by TOWCH » Sat Jan 10, 2009 3:21 pm
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by jago25_98 » Tue Oct 25, 2011 6:06 am
Simplest way has to be time delay opening.
Run by Arduino,
charged by induction,
fabricated by 3D printer.
I expect to see CAD files uploaded by the morning, night!
-j
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