Comments for Way of the exploding head

Comment on Whirlygig RNG by » Whirlygig, Hardware RNG per Linux

» Whirlygig, Hardware RNG per Linux — Thu, 18 Feb 2010 12:20:42 +0000

[...] Green ha realizzato un piccolo dispositivo USB, Whirlygig, che potete riprodurre da soli e collegare alla vostra linux box. Il cuore del sistema utilizza un [...]

Comment on Whirlygig Verification and rngtest analysis by Whirlygig, Hardware RNG per Linux | bruno trani dot info

Whirlygig, Hardware RNG per Linux | bruno trani dot info — Thu, 18 Feb 2010 12:04:32 +0000

[...] il software per realizzare il tutto da soli. Per confermare la validità dell’approccio sono verificati che i dati generati fosse effettivamente casuali ed il risultato è più che [...]

Comment on Whirlygig Verification and rngtest analysis by sysadmn

sysadmn — Wed, 10 Feb 2010 16:52:11 +0000

Re: Monobit
A detailed discussion of the tests is at http://www.random.org/analysis/Analysis2005.pdf. It is presented in the context of testing random.org’s randomness, but the results apply to WhirlyGig as well.

I’m not a statistician, but here’s what I think is happening.
The test maps 0 -> -1, and 1->1. Sum all the bits in the block, and then normalize (take the absolute value, so the error “too many 0’s” is the same as “too many 1’s”, then divide by the square root of the number of bits in the block).

This normalized value is put in the “complementary error function” (erfc) to get a P-value. erfc(x) is the area under the normal curve above x (far right). (Actually, you have to divide the nomalized value by sqrt(2)…) I think it is interpreted like this: If you conclude the sum you got did not come from a random block, you’ll be wrong p % of the time.

So what’s 275? If you work through the math, for your block size of 20000 bits, 275 gives a P-value of 0.05. So if you see a sum of 275 or more, and you reject the block as not random, you’ll be wrong 5% of the time.

Comment on Whirlygig PCB by Hardware based randomness for Linux - Hack a Day

Hardware based randomness for Linux - Hack a Day — Sat, 06 Feb 2010 19:16:32 +0000

[...] ‘/dev/random’ using the ring-tools package. [Andy's] done a lot of testing, both on the hardware, and on the quality of randomness. We didn’t see an option to order this but he’s got [...]

Comment on Whirlygig RNG by Hardware based randomness for Linux - Hack a Day

Hardware based randomness for Linux - Hack a Day — Sat, 06 Feb 2010 16:22:48 +0000

[...] randomness can be hard to come by in the digital world. [Andy Green] is making it easier to get true entropy by using this random USB dongle. The Whirlygig uses a CPDL to gather data from a set of of oscillators. The oscillators have a [...]

Comment on Whirlygig RNG by SYN-RST-Blog » Blog Archive » Nicht genug Entropie

SYN-RST-Blog » Blog Archive » Nicht genug Entropie — Sun, 18 May 2008 12:06:29 +0000

[...] ist der USB Zufallsgenerator, welches unter warmcat.com vorgestellt [...]

Comment on Whirlygig RNG by Way of the exploding head » Blog Archive » Whirlygig GPL’d HWRNG

Way of the exploding head » Blog Archive » Whirlygig GPL’d HWRNG — Sat, 24 Nov 2007 10:45:47 +0000

[...] made available the result of the ring oscillator random generator as a GPL project called Whirlygig. It’s a 2.75cm x 4cm PCB with a mini USB connector, it provides a sustained 5.5Mbps [...]

Comment on mac80211 Injection patches accepted in Linus git tree by bahathir

bahathir — Thu, 30 Aug 2007 05:27:45 +0000

Congratulation!. I hope, that will increase your motivation to develop mac80211 and other related things.

You can achieve your goal, with hard works, good convincing, explanation and reasoning,; and l ast and not the least, PATIENT.

TQ.

Comment on Old Tech by unicks

unicks — Sat, 31 Mar 2007 18:27:26 +0000

There are great Q931 testers and protocol analysers that will really help you out, they are very pricey but you can rent them, they will save a lot of gried. They look like 90s luggable PCs as they have full size ISDN PCI cards inside them. Check out GN NetTest for the best in the market http://www.nettest.com

Comment on Old Tech by andy

andy — Sat, 31 Mar 2007 08:13:42 +0000

Thanks for the comment unicks — due to start looking at the D channel stuff in the next couple of months due to delays at that customer. It’s heartening to hear that we deal with a “restricted subset”… I guess I too will be having “endless fun” sending things to BT and seeing if it works. The device intercepts the ISDN connection so I will have double the alleged fun sending things to an ISDN switchboard and seeing if that side works too.