Caesar's Revenge (hybrid cipher: ceasar shift/homophonic)

[Mike Sanders]

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