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Re: Re: VMs: Further investigatio of folio f1r

         Hello Dennis,  

right you are. My only excuse is that while "letter" frequency of the VM 
followed Latin (but the text was still hidden even after the conversion) the 
transposition cipher was the only one which, additional used, would keep  the 
frequency intact. 

It is also true that transposition  ciphers were not too popular in middle 
ages, when the art of substitution  cipher was  blossoming,  they already 
developed the grill. I guess our problem is complicated by the fact we take our 
rules indiscriminately: Zipf's laws and second entropy rules are based on certain 
assumptions only  - which, I have to admit, are not quite clear to me.

Best regards.  Jan  
======= At 2004-04-07, 00:36:00 you wrote: =======

>Jan wrote:
>> ... One interesting thing: while there are meny methods published for solving the substitution ciphers, there are only few for transposition ciphers and ac tually quite cumbersome ( see Lanaki lectures on Net On the other hand). Stuill, those are the  most underestimated ciphers and in complex form very difficult to solve (especially if we do not know the language). 
>	I still think that almost any transposition cipher
>would increase rather decrease the second order entropy
>from that of the source text.  It also would break up
>any underlying digraphs, etc.  Most transposition
>ciphers I've seen also break up word divisions.  
>	(On the other hand, most transposition ciphers are
>easy to solve for short message and hard to solve for
>longer ones, if they operate on the whold message.) 

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