rotten news relay - comp.unix.bsd.misc - Caesar's Revenge (hybrid cipher: ceasar shift/homophonic)

Subject: Caesar's Revenge (hybrid cipher: ceasar shift/homophonic)
From: Mike Sanders
Newsgroups: comp.unix.bsd.misc
Organization: albasani.net
Date: Sun, 9 Apr 2017 18:00 UTC

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From: mike@porkchop.bsd (Mike Sanders)
Newsgroups: comp.unix.bsd.misc
Subject: Caesar's Revenge (hybrid cipher: ceasar shift/homophonic)
Date: Sun, 9 Apr 2017 18:00:51 +0000 (UTC)
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A nifty little awk script for the puzzle minded:

'Caesar's Revenge is pencil & paper cipher combining the classic
Ceasar shift cipher[i] & the concept of homophones[ii].
A homophone is defined as groupings of things that resemble
one another but are in reality different.

Example homophones: heir/hair, oar/or, sum/some, 4/for...

A limitation of the classical ceasar cipher is that its prone
to attack by frequency analysis[iii] due in part to the
fact that characters can often repeat themselves in a predictable
manner. This is especially true for certain letters
in the English alphabet (listed here by usage): ETAOIN[iv].

One way to lessen the frequency of character reuse is to map an
often used character to a range of unique characters. Letter 'E'
for example, could in one instance be written as 'K' & in another
instance written as '8'. By diffusing commonly used letters, we
can greatly reduce the surface area of attack & that's where
homophones can help...'

<https://busybox.hypermart.net/caesars-revenge.html>

--
later on,
Mike

https://busybox.hypermart.net

Subject	Author
Caesar's Revenge (hybrid cipher: ceasar shift/homophonic)	Mike Sanders

BOFH excuse #96: Vendor no longer supports the product

comp / comp.unix.bsd.misc / Caesar's Revenge (hybrid cipher: ceasar shift/homophonic)