Thus spake Poul-Henning Kamp ([EMAIL PROTECTED]):
> >between events. Because of this your T3 value can be considered the T1
> >value for the next random bit you generate.
> No it cannot. If you did that then the probability would skew from
> bit to bit. If the (t3-t2) was large bit N == 1 and
On Wed, 02 Aug 2000 06:15:41 +0200, Poul-Henning Kamp <[EMAIL PROTECTED]> wrote:
>>> If I generate true random bits it takes 3 timestamps to get one
>>> bit of randomness:
++--+---+--+-+
T1 T2 T3 T4 T5T6
>>> if (T2 - T1 > T3 - T2)
>>>
In message <[EMAIL PROTECTED]>, Warner Losh writes:
>In message <[EMAIL PROTECTED]> Poul-Henning Kamp writes:
>: The earphone output of the geiger counter with a 1kOhm load generates
>: a nice TTL level pulse which can be fed onto pin 10 of the parallel
>: port and timestamped with the PPS-API dev
In message <[EMAIL PROTECTED]>, John Cochran writes:
> [snip...]
>
>> If I generate true random bits it takes 3 timestamps to get one
>> bit of randomness:
>>
>> T1: Time of event 1
>> T2: Time of event 2
>> T3: Time of event 3
>>
>> if (T2 - T1 > T3 - T2)
>> re
In message <[EMAIL PROTECTED]> Poul-Henning Kamp writes:
: The earphone output of the geiger counter with a 1kOhm load generates
: a nice TTL level pulse which can be fed onto pin 10 of the parallel
: port and timestamped with the PPS-API device ("device pps").
How does the variable, but somewhat
[snip...]
> If I generate true random bits it takes 3 timestamps to get one
> bit of randomness:
>
> T1: Time of event 1
> T2: Time of event 2
> T3: Time of event 3
>
> if (T2 - T1 > T3 - T2)
> return 0;
> else if (T2 - T1 < T3 - T2)
>
In message <[EMAIL PROTECTED]>, "Jonathan M. Bresler"
writes:
>
>http://www.fourmilab.ch/hotbits/
Yup, that's where I got the idea. Difference is that I interface the
geiger directly to a UNIX system, he has all sorts of magic stuff
in the middle...
--
Poul-Henning Kamp | UNIX since Zilo
http://www.fourmilab.ch/hotbits/
jmb
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| Indeed, Poul's idea has massive geek potential.
|
| However, for the geek impaired, there is always the 82802 Random
| Number Generator which is included on newer Intel chipsets. It may
| not be the holy grail of randomness, but nearly every PC will have
| one, and I think it'd be good if Fre
> I'm pretty sure that "noise-diodes" are probably the most efficient
> way to generate random bits, but it doesn't measure up to a geiger-
> counter when it comes to "geek value" :-)
hehe.. I would try making the speaker click according to the
geiger events .. :)
Regards,
Marc
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On Tue, 1 Aug 2000, Poul-Henning Kamp wrote:
> In message <[EMAIL PROTECTED]
> e>, Paul Herman writes:
>
> >But, if you are gathering a geek lobby to convince Intel to have an
> >onboard geiger counter, you just might have a new member ;-)
>
> "Cesium-137 inside"
>
> Yeah, it does have a
In message <[EMAIL PROTECTED]
e>, Paul Herman writes:
>But, if you are gathering a geek lobby to convince Intel to have an
>onboard geiger counter, you just might have a new member ;-)
"Cesium-137 inside"
Yeah, it does have a ring to it, doesn't it ? :-)
--
Poul-Henning Kamp | U
> I located a surplus german geiger counter cheaply [1], I have always
> wanted to have one anyway, and in my junkbox I already had an old
> smoke alarm [2]. The Geiger counter has a thin-walled tube which
> takes about 15 events per second from the Am-241 source in the
> smoke alarm.
Very cool
On Tue, 1 Aug 2000, Poul-Henning Kamp wrote:
> There are many ways to get random bits, this was just meant as an
> example that it doesn't have to be hard or even difficult to use
> FreeBSD for "special tasks".
>
> I'm pretty sure that "noise-diodes" are probably the most efficient
> way to gen
In message <[EMAIL PROTECTED]>, Matthew Seaman writes:
>Poul-Henning Kamp wrote:
>>
>> Ok, some people just can't leave an open end dangling (people like
>> me for instance :-)
>>
>> I located a surplus german geiger counter cheaply [1], I have always
>> wanted to have one anyway, and in my junk
Poul-Henning Kamp wrote:
>
> Ok, some people just can't leave an open end dangling (people like
> me for instance :-)
>
> I located a surplus german geiger counter cheaply [1], I have always
> wanted to have one anyway, and in my junkbox I already had an old
> smoke alarm [2]. The Geiger counte
On Mon, 31 Jul 2000, Poul-Henning Kamp wrote:
> [3] Feel free to analyze:
Could you post a larger sample (say, 10MB) somewhere for statistical
analysis? The 1939 bytes here look pretty good at first glance:
1939 samples, total weight 7729, average weight per sample 3.986075
Bit 0 average weight
Ok, some people just can't leave an open end dangling (people like
me for instance :-)
I located a surplus german geiger counter cheaply [1], I have always
wanted to have one anyway, and in my junkbox I already had an old
smoke alarm [2]. The Geiger counter has a thin-walled tube which
takes ab
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