[Cryptography] Imitation Game: Can Enigma/Tunney be Fixed?

Dave Horsfall dave at horsfall.org
Fri Jan 9 13:34:49 EST 2015

On Thu, 8 Jan 2015, Ray Dillinger wrote:

> [...] gives an alphabet of 28 symbols, which encompasses the 26 letters 
> and gives you two more - to use probably for "switch to numbers" and 
> "switch to numbers then look up the number in a codebook" respectively.

No; you'd need a symbol to get back to letters again.  In the old Teletype 
days using the 5-bit Murray/Baudot code, one symbol was LTRS and another 
was FIGS, both of which were state-independent and dropped you into the 
appropriate alphabet.

Made for amusing times if LTRS/FIGS were not decoded properly due to
noise; no ARQ or FEC back then...

Either that, or your FIGS would act on the following symbol only, which I 
suppose is do-able.

Dave Horsfall DTM (VK2KFU)  "Bliss is a MacBook with a FreeBSD server."
http://www.horsfall.org/spam.html (and check the home page whilst you're there)

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