Anoraks Corner by Tony Sale
You need some hints to break Enigma?

Scenario 5.
Itercept date: 5th November 1944 on a German Air Force frequency.

172OKR 5TLE 250 WRB HOW SKN

GSBGH XBVGJ PPIOW OFTBM USYBT IRQRZ OLYVM JHLKO

WYLZO BYWYM TPBAN IOHZY FJGRQ ZBITM ICEPC AZIMO

CMIGF XOUWC XVQKV IZPZX SOYEL UWWCL FJBQB ZQTEV

KCGNS GVMCT CRNIB CCJWW EDKBG TBORD KXZUA ICXOX

MNPGC ADTWT JCBYJ CEKIY WKCJK PAQBJ UTATU ZNDZZ

YOSZF WYVXV XLEQY QWSUI XZXOH FMXPS LLKIL QKCGT

QNTKZ OUZXW

On the original intercept were written JPA JZQ (possibly the start and end Enigma wheel letters for the original decrypt) and this is thought to be the original German message.

EINSXZUSAMMENFASSUNGDERAUFKLARRUNGSERGEB

NISSIVOMXVIERXELFXVIERVIERXABLESQLOSSLNX

VIERXELFXEINSSIEBENNULLNULLXUHRYYAUFKLAE

RUNGDURQIETTERLKGEUNDPLATZZUSTXNDBEHINDE

RTYYAUFSTRASSENIMRAUMWESTUNCNORDWESTXBEL

GRADXKEINEGROEBSERENBEWEGUNGENOYUEBERKSA

VESAVEYBEI

This is the message to decipher using the Enigma configuration found by breaking the above cipher text.

CACS5 25/01/03 AES JZR BYS

PXYLL QMUBD HIMWA TXJKC ZTSHU VJUHL SSCGQ JDIBD

DFVWK AAAXU UCFDQ LBARC OTSUB FDANG

Hints:

German Air Force 1944 means wheels 1 to 5 available from which to select 3.

Because such a long crib is available, the modulo 26 method is best for finding a menu. See this for an example.

When you have a good menu Look at Intro to the High Speed Bombe and make up a text file of data using Wordpad. Save this into the \anoraks\tools\hsbombe folder and then exit this html page and run bombe.exe from \anoraks\tools on your hard disk.

When you have achieved a Bombe stop, use a 3 wheel Army/Air Force Enigma from \anoraks\tools to check that the stop wheel order, wheel letters and steckers decipher the cipher text into the German text.

When this goes wrong you have either found some more steckers or you have found the turnover point for the right hand wheel.

To set the turnover point correctly, change the ring setting on the right hand wheel.

Now you need to get the true ring settings for the left hand and centre wheels. The clue here is that the deciphering start letters had been found to be JPA, so you need to change the rings so that your core postions are where you have found them with J and P in the windows.

The check that you have it right is to turn the wheels to HOW, the indicator, and decipher SKN the message key, if this gives JPA you have got it right.

Finally, decipher the second message after finding the wheel start position by deciphering the message key from the indicator wheels start position.

You may need to print this then go look for tools.

This page was originally created by the late Tony Sale, the original curator of the Bletchley Park Museum,

Anoraks Corner by Tony Sale You need some hints to break Enigma?

Scenario 5.

Anoraks Corner by Tony Sale
You need some hints to break Enigma?