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Bill Cox
2014-11-02 10:19:22 -05:00
parent 57f07df6c9
commit ca1614a51d
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README.md
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@@ -498,33 +498,33 @@ only 7 are used.
A common program used to estimate entropy in a data stream is "ent". A sample data file
was created this way (using one of the original V1 boards):
$ sudo ./infnoise-v1 --raw --debug > foo
...
Generated 14680064 bits. OK to use data. Estimated entropy per bit: 0.866710, estimated
K: 1.823500
num1s:49.888504%, even misfires:0.159748%, odd misfires:0.127300%
Generated 15728640 bits. OK to use data. Estimated entropy per bit: 0.866856, estimated
K: 1.823684
num1s:49.901504%, even misfires:0.145973%, odd misfires:0.160365%
Generated 16777216 bits. OK to use data. Estimated entropy per bit: 0.867010, estimated
K: 1.823879
num1s:49.963040%, even misfires:0.146815%, odd misfires:0.145067%
$ sudo ./infnoise-v1 --raw --debug > foo
...
Generated 14680064 bits. OK to use data. Estimated entropy per bit: 0.866710, estimated
K: 1.823500
num1s:49.888504%, even misfires:0.159748%, odd misfires:0.127300%
Generated 15728640 bits. OK to use data. Estimated entropy per bit: 0.866856, estimated
K: 1.823684
num1s:49.901504%, even misfires:0.145973%, odd misfires:0.160365%
Generated 16777216 bits. OK to use data. Estimated entropy per bit: 0.867010, estimated
K: 1.823879
num1s:49.963040%, even misfires:0.146815%, odd misfires:0.145067%
Here's ent's results on the raw data stream this run produced:
$ ent foo
Entropy = 7.318058 bits per byte.
Optimum compression would reduce the size
of this 2072576 byte file by 8 percent.
Chi square distribution for 2072576 samples is 1510131.51, and randomly
would exceed this value 0.01 percent of the times.
Arithmetic mean value of data bytes is 127.5088 (127.5 = random).
Monte Carlo value for Pi is 3.427100794 (error 9.09 percent).
Serial correlation coefficient is -0.005035 (totally uncorrelated = 0.0).
$ ent foo
Entropy = 7.318058 bits per byte.
Optimum compression would reduce the size
of this 2072576 byte file by 8 percent.
Chi square distribution for 2072576 samples is 1510131.51, and randomly
would exceed this value 0.01 percent of the times.
Arithmetic mean value of data bytes is 127.5088 (127.5 = random).
Monte Carlo value for Pi is 3.427100794 (error 9.09 percent).
Serial correlation coefficient is -0.005035 (totally uncorrelated = 0.0).
The health monitor does a much better job at estimating the entropy than ent. The actual
non-randomness is 60% higher than ent predicted. Ent said 0.915 bits of entropy per bit,