Cryptography-Digest Digest #821, Volume #10 Sun, 2 Jan 00 07:13:01 EST
Contents:
Re: The Cipher Challenge from the Code Book ("Roger Peniston-Bird")
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From: "Roger Peniston-Bird" <[EMAIL PROTECTED]>
Subject: Re: The Cipher Challenge from the Code Book
Date: Sun, 02 Jan 2000 10:51:58 GMT
Sisson <[EMAIL PROTECTED]> schrieb in im Newsbeitrag:
[EMAIL PROTECTED]
> Hello All!
> Could someone help me with Stage 3: Monoalphabetic Cipher with
> Homophones
>
> my main question is, what does "Monoalphabetic Cipher with Homophones"
> mean? is it Homophonic substitution (p52)? if it is, why is the example
> of the book numerical, and why when put through frequency analycist Q
> has 18.4%?
It was X, not Q that had 18.4%.
My first thought was that X might stand for spaces, but this left too many
one character words.
I then suspected that the text might be German, since this is the frequency
of the letter E in that language.
Alternately, thinking aloud, so to speak, what about umlauts? If the code
uses ae, oe and ue instead, this could account for the high proportion of
Xs.
I found somewhere in the newsgroup the Helen Fouche Gaines comparative
table of English, German, French frequencies for single letters. But this
gives no data on frequency of German vowels with/without umlauts or French
accented characters, or of digraphs and trigraphs in these languages.
Obviously the frequency table will be different according to whether you
represent an umlauted a as � or ae!
Can anyone help? Either with a table, or a Word97 macro that I can run over
some long German/French text to derive my own table,a shareware program, or
the name of a book that contains such information?
Many thanks
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