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The Japanese Enigma
The Enigma T, codenamed Tirpitz, was developed during WWII by the Germans
especially for use by the Japanese Army. It was based on the
commercial Enigma K,
but had differently wired wheels and multiple
turnovers on each wheel. Furthermore, it had an Eintrittswalze (ETW)
that was differently wired than on all other Enigma machines.
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At present we don't have a suitable photograph of the Enigma T,
but we do have some hi-res images of one of its wheels.
The image on the right shows wheel number 3. Clearly visible
on this side of the wheel is the turnover ring that has 5 notches.
This wheel belongs to the Tirpitz Enigma with serial number T47
that is part of the private collection of the British Intelligence
Service GCQH.
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The table below shows the wiring
[1]
of the Enigma T wheels,
the entry disc (Eintrittswalze, ETW) and the
reflector (Umkehrwalze, UKW). The rightmost column
shows what letter is visible in the window when the wheel
causes a turnover of the wheel to the left of it.
Please note that these positions are different from the
actual position of the notches on the circumfere of the wheel.
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| Wheel |
ABCDEFGHIJKLMNOPQRSTUVWXYZ |
Notch |
Turnover |
# |
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| ETW |
KZROUQHYAIGBLWVSTDXFPNMCJE |
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*1 |
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| I |
KPTYUELOCVGRFQDANJMBSWHZXI |
EHMSY |
WZEKQ |
5 |
| II |
UPHZLWEQMTDJXCAKSOIGVBYFNR |
EHNTZ |
WZFLR |
5 |
| III |
QUDLYRFEKONVZAXWHMGPJBSICT |
EHMSY |
WZEKQ |
5 |
| IV |
CIWTBKXNRESPFLYDAGVHQUOJZM |
EHNTZ |
WZFLR |
5 |
| V |
UAXGISNJBVERDYLFZWTPCKOHMQ |
GKNSZ |
YCFKR |
5 |
| VI |
XFUZGALVHCNYSEWQTDMRBKPIOJ |
FMQUY |
XEIMQ |
5 |
| VII |
BJVFTXPLNAYOZIKWGDQERUCHSM |
GKNSZ |
YCFKR |
5 |
| VIII |
YMTPNZHWKODAJXELUQVGCBISFR |
FMQUY |
XEIMQ |
5 |
| UKW |
GEKPBTAUMOCNILJDXZYFHWVQSR |
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1) Note that this is the only machine with a different wiring for the
ETW. All other Enigma machines have an ETW that is wired either in
the order of the alphabet (ABCDEF...) or the order of the keyboard
(QWERZU...).
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