Re: 47bit to 10 char A,,,Z revisted
From: David A. Scott (daVvid_a_scott_at_email.com)
Date: 04/24/05
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Date: Sun, 24 Apr 2005 19:34:46 +0000 (UTC)
"David A. Scott" <daVvid_a_scott@email.com> wrote in
news:Xns9641E3DC0F7D2H110W296LC45WIN3030R@213.155.197.138:
> I just moded arb255 to do the conversion to the 26
> character A..Z for the uncompress in a bijective way
> The fact is you can't code all binary bit strings
> from 1 bit to 47 bits with strings of ASCII A..Z
> where you allow only 1 to 10 character in a string.
>
> I took 11100011100011100011100011100011100011100011100
> from http://home.ecn.ab.ca/~jsavard/crypto/mi060301.htm
> use A012B01 to convet the string to a 8 byte file.
6 byte file
> and got AIYEKQQRVV from the file. This happens to be
> 10 character but its just bijective luck.
>
> Any way without games the 47 bit to 10 char would
> take a file of 58750 bytes which is 470,000 bits
> and always give a 100,000 char file of A..Z
>
> I took a file from random.org 58752 bytes and
> used by code to generate 99,994 character.
>
> Also test 100,0000 char files of all A B C up to
> Z for 26 files. The all A represnted a 58,755 byte
> file. The rest of all B to all Z where exactly
> 58,756 bytes. Meaning the bijective code mod to
> arb255 handles it much better and allows for any
> bit strings not just a multiple of 47bits.
>
> I like to think of bijective compression as a step
> one should take. In the above example. Suspose some
> one had a file to encrypt and they only had an enigma
> type of machine with 1 to 26 characters. If someone
> was trying to crack the enigma encryption. They might
> have a handle on the code if they knew 47 to 10 char
> comversions being done to get it into A,,Z to encrypt
> and send. Since many combinations are not possible
> most keys would go to impossible character blocks if
> long messages. However with the bijective conversion
> any pattern is possible so no handle there to weaken
> it.
>
> This is sci.crypt why not to it right?
>
Anyway no page yet but the bijective
stuff at my site.
A012B01 file.in file.out
converts pure ascii 1 0 string to a binary byte
file bijectvely
ABZT2 file.in file.out
expands byte file to pure ASCII file A..Z
bijectively
UNABZT2 file.in file.out
takes pure ASCII file A..Z
converts to binary byte file
bijectively
B012A01 file.in file.out
converts binary byte file to
pure ASCII FILE of 1 0
bijectively
ABZT2 mod of arb255 with as few changes
as possible. best structure a tree but
did a chain for ease of coding. note a
long random file will convert to a long
file where each character A..Z will appear
will 1/26 of the time in the limit.
for disscuss of ACSCII 26 ARMOUR see
http://home.ecn.ab.ca/~jsavard/crypto/mi060301.htm
David A. Scott
-- My Crypto code http://bijective.dogma.net/crypto/scott19u.zip http://www.jim.com/jamesd/Kong/scott19u.zip old version My Compression code http://bijective.dogma.net/ **TO EMAIL ME drop the roman "five" ** Disclaimer:I am in no way responsible for any of the statements made in the above text. For all I know I might be drugged. As a famous person once said "any cryptograhic system is only as strong as its weakest link"
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