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Old 12-03-2012, 12:26 PM   #1
gacanepa
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Registered: May 2012
Location: San Luis, Argentina
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Question /dev/random "environment noise" from device drivers?


Hi everyone,
After reading the man page for /dev/random (as I wanted to know what is was) it states that
Code:
The random number generator gathers environmental noise from device drivers and other sources into an entropy pool. The generator also keeps an estimate of the number of bits of noise in the entropy pool. From this entropy pool random numbers are created.
I am having kind of a hard time trying to understand 2 concepts:
1) "Environment noise"
2) "Entropy pool"
Would any of you be as kind as to shed some light on this?
Thanks in advance.
 
Old 12-04-2012, 06:50 AM   #2
business_kid
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Try thinking of a scheme to logically create different random numbers . . . .

Now that you see the problem, noise probably has some program-specific application, but the key factor is unpredictability. If it's predictable, it's repeatable, ergo not random. See the entropy pool as a long string of numbers on a page that one can pick random digits from to form your random number.
I thought the current node of preference was /dev/urandom anyhow, because /dev/random wasn't random enough.
 
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Old 12-04-2012, 06:59 AM   #3
gacanepa
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Quote:
Originally Posted by business_kid View Post
Try thinking of a scheme to logically create different random numbers . . . .

Now that you see the problem, noise probably has some program-specific application, but the key factor is unpredictability. If it's predictable, it's repeatable, ergo not random. See the entropy pool as a long string of numbers on a page that one can pick random digits from to form your random number.
I thought the current node of preference was /dev/urandom anyhow, because /dev/random wasn't random enough.
Thanks a lot! I am going to mark this thread as SOLVED and add to your reputation right now . Happy holidays!
 
  


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