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sudo apt-get install ent
root@raspberrypi:~/rng# ent out.bin
Entropy = 7.900783 bits per byte.
Optimum compression would reduce the size
of this 2005 byte file by 1 percent.
Chi square distribution for 2005 samples is 264.27, and randomly
would exceed this value 50.00 percent of the times.
Arithmetic mean value of data bytes is 127.5781 (127.5 = random).
Monte Carlo value for Pi is 3.185628743 (error 1.40 percent).
Serial correlation coefficient is 0.021662 (totally uncorrelated = 0.0).
root@raspberrypi:~/rng# ent out1.bin
Entropy = 7.829581 bits per byte.
Optimum compression would reduce the size
of this 1199 byte file by 2 percent.
Chi square distribution for 1199 samples is 265.05, and randomly
would exceed this value 50.00 percent of the times.
Arithmetic mean value of data bytes is 125.2644 (127.5 = random).
Monte Carlo value for Pi is 3.256281407 (error 3.65 percent).
Serial correlation coefficient is 0.033513 (totally uncorrelated = 0.0).
root@raspberrypi:~/rng# ent out2.bin
Entropy = 7.253107 bits per byte.
Optimum compression would reduce the size
of this 2094 byte file by 9 percent.
Chi square distribution for 2094 samples is 2354.83, and randomly
would exceed this value 0.01 percent of the times.
Arithmetic mean value of data bytes is 126.8706 (127.5 = random).
Monte Carlo value for Pi is 3.426934097 (error 9.08 percent).
Serial correlation coefficient is 0.010534 (totally uncorrelated = 0.0).
root@raspberrypi:~/rng# ent out3.bin
Entropy = 7.874998 bits per byte.
Optimum compression would reduce the size
of this 1420 byte file by 1 percent.
Chi square distribution for 1420 samples is 244.36, and randomly
would exceed this value 50.00 percent of the times.
Arithmetic mean value of data bytes is 124.7901 (127.5 = random).
Monte Carlo value for Pi is 3.169491525 (error 0.89 percent).
Serial correlation coefficient is 0.019137 (totally uncorrelated = 0.0).
root@raspberrypi:~/rng# ent out.bin
Entropy = 7.841278 bits per byte.
Optimum compression would reduce the size
of this 1173 byte file by 1 percent.
Chi square distribution for 1173 samples is 248.86, and randomly
would exceed this value 50.00 percent of the times.
Arithmetic mean value of data bytes is 130.0068 (127.5 = random).
Monte Carlo value for Pi is 3.117948718 (error 0.75 percent).
Serial correlation coefficient is -0.003621 (totally uncorrelated = 0.0).
$ time grep -i жопа /dev/urandom
Binary file /dev/urandom matches
real 0m13.895s
user 0m0.615s
sys 0m13.165s