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[liberationtech] TEXTCOMBINE-REV, A software for combining text files to obtain high-quality pseudo-randomness in practice (replacing an earlier retracted software)

mok-kong shen mok-kong.shen at t-online.de
Thu Aug 31 15:01:27 PDT 2017


An earlier software of mine, TEXTCOMBINE-SP, posted to this group was not
satisfactory due a bug in a function employed in its design and was 
retracted.

I am posting now its replacement TEXTCOMBINE-REV which has been carefully
tested and has a fairly good performance IMHO. The following is 
extracted from its
Prologue:

# What has been achieved by the present software can be tersely 
summarized as
# follows, assuming the general case where the text files are sufficiently
# large:
#
# (1) The generated byte sequences pass, via design specifications of the
#     software, Maurer's universal test and the autocorrelation test for 
all
#     d in the range [1, 16] as well as the ENT test with an entropy value
#     according to it of at least 7.99 bits per byte. The software is 
namely
#     coded such that it would give up, reporting failure, after a certain
#     specified maximum amount of processing has been done without finding
#     a solution.
#
# (2) An extensive expermiment of the present author done on all different
#     combinations, totalling 3060 in number, of 4 source materials (of 
size
#     600 KB each) taken from 18 different books of English literature
#     downloaded from Project Gutenberg resulted in the following:
#
#     (a) No case of failure was ever encountered. On the contrary, the 
above
#         mentioned processing limit, which is in terms of rounds of 
certain
#         preprocessing of source materials before they are xor-ed 
together,
#         was by far not being approached in the experiment. For 
details, see
#         Epilogue.
#
#     (b) The worst case of entropy according to ENT in the experiment was
#         higher than 7.995 bits per byte and the average CPU-time was 
less than
#         15 sec on author's PC.

The software is available at http://mok-kong-shen.de

M. K. Shen


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