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 the
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)
return 0;
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 counter has
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 junkbox I already
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 generate
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 and
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 | UNIX
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 ring to it,
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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
http://www.fourmilab.ch/hotbits/
jmb
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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 Zilog
[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)
return 1;
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
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 device
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
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
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