VMs: For Vladimir Sazonov re-explaining triplet cipher

["Jeff" <jeff@xxxxxxxxxxxxxxxxxxxxxx>]

----- Original Message -----
From: "Jeff" <jeff@xxxxxxxxxxxxxxxxxxxxxx>
To: <vms-list@xxxxxxxxxxx>
Sent: 21 December 2003 00:31
Subject: VMs: Polymorphic cipher (sorry for the confusion)


> Please read the following and let me know if it is plain enough. I guess
I'm
> just rubbish at explaining things. Sorry.
>
> Jeff
>
> ----- Original Message -----
> From: "Jeff" <jeff@xxxxxxxxxxxxxxxxxxxxxx>
> To: <vms-list@xxxxxxxxxxx>
> Sent: 21 December 2003 00:26
> Subject: Re: VMs: Three frequency tables
>
>
> > Nick Pelling incoming@xxxxxxxxxxxxxxxxx
> > 20 December 2003 17:08
> > Subject: Re: VMs: Three frequency tables
> >
> >
> > > Hi Jeff,
> > >
> > > At 16:38 20/12/2003 +0000, Jeff wrote:
> > > >Dennis tsalagi@xxxxxxxx wrote
> > > > > But what else are you thinking of?  Do you mean that
> > > > > you don't think the gallows are just markers for cipher
> > > > > change?  (I've never liked that either, but that
> > > > > because it doesn't look like a polyalphabetic cipher to
> > > > > me.)
> > > >
> > > >The VMS is a polymorphic alphabetic cipher. There is a difference.
> > >
> > > What is a "polymorphic alphabetic cipher"? What is the difference
> between
> > > one of those and a polyalphabetic cipher?
> > >
> > > Cheers, .....Nick Pelling.....
> > >
> >
> > The polymorphic cipher will not give a letter for letter substitution.
> Like
> > a polyalphabetic. However single substitution is not used. An example.
> >
> > Take a line from the VMS.
> >
> > shoy.ckhey.kodaiin.cphy.cphodaiils.cthey.she.oldain.d
> >
> > We need to analyse this with all spaces removed. The analysis will look
> for
> > triplets of EVA characters. It could also be applied to a text with cth
> etc
> > substituted with single letters if that is your preference. You then get
a
> > table of occurance counts part of which is shown below.
> >
> > cho - 522
> > iin - 376
> > aii - 357
> > dai - 255
> > hol - 253
> > hor - 234
> > chy - 231
> > cth - 208
> > sho - 186
> > tch - 163
> > kch - 162
> > che - 148
> > hod - 98
> > otc - 95
> > cha - 86
> >
> > The numbers indicate how many times the triplet occurs, both within VMS
> > words and across word boundaries. When we begin to plot letters for
these
> > individual triplets we can start to place conconant and vowel positions.
> > Here is the same part of the table partially filled in.
> >
> > cho - 522 e
> > iin - 376 e
> > aii - 357 l
> > dai - 255 l
> > hol - 253 l
> > hor - 234 r
> > chy - 231 o
> > cth - 208 i
> > sho - 186 e
> > tch - 163 n
> > kch - 162 c
> > che - 148 c
> > hod - 98  r
> > otc - 95  e
> > cha - 86
> >
> > Here is the same line above using the full table with assumed
> substitutions.
> > Where each identified triplet stands for one letter.
> >
> > __e_.__cci.lacalle.dico.decarallio.__ici.__e.istale.n
> > shoy.ckhey.kodaiin.cphy.cphodaiils.cthey.she.oldain.d
> >
> > Note the "phrase" la calle dico de carralio. Letters always resolve into
> set
> > positions with this method. If you already have the pattern d_c_ it will
> > usually place an i between the d & c and an o after the c. The VMS
> patterns
> > do this automatically and cannot be influenced by changes to the method.
> > Syllable formation just happens automatically. Unlike my previous
attempts
> > with pairified ciphers, illegal multiple vowel and consonant groups just
> > don't form.
> >
> > Each triplet final glyph position will stand for a single substitution
> > letter for that triplet only. So an h at the end of kch will produce a
> > different letter than the h at the end of cth. Hence polymorphic. The
> > pattern changes with varied pathways through the table. This is the
> > information I sent to Jacques Guy that he used for his own cipher and
> which
> > produced the interesting entropy values.
> >
> > If his tests on Latin, German and Greek differ in any way from his
English
> > tests then that will be very interesting.
> >
> > NOTE A high percentage of triplets occur with below 20 occurances and
> could
> > be links to realign word ending patterns to maintain the repetative
> > structure. The entropy match alone seems significant. However I am now
> > finding a divergence from Italian using some new tests. This could arise
> > from the forced structure imposed on the text. This would disrupt any
> > attempt to do language pattern matching.
> >
> > My next step is to analyse triplet distances, where I select two
distinct
> > triplets and measure average distance between them on lines where they
> both
> > occur. If these numbers are consistent then I can assume syntactical
> > structure and not simply random mechanical construction.
> >
> > Again all comments welcome.
> >
> > Jeff
> >
> >
>
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