Patrick-Dussault

Linux and Entropy

Blog Post created by Patrick-Dussault Employee on Dec 23, 2016

Entropy determine how predictable the second random number might be.
So if you have low entropy around 200, then the random numbers are
more predictable than if you have a pool of 2000. This might have the
impact on the kernel to face delay to get the most unpredictable
random number.

 

To get enough entropy on Linux system, close to the max of 4096bits, run
the rngd command as following :

 

# rngd -r /dev/urandom

 

You'll see the entropy pool increasing.

 

# cat /proc/sys/kernel/random/entropy_avail
4096
# cat /proc/sys/kernel/random/entropy_avail
3072

 

etc.

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