Practice Message -- Juergin Approved

[Jeff Spears]

Radio School:

The people who do cryptography are trained and know what to expect.
This message uses a modified version of US Navy message format. Here
is an example that shows the format of my message:

APR 01 0500Z    ;The Z means UTC or GMT. I chose not to use a year.
FM MOM
TO JEFFREY
BT
MAKE SURE TO CHANGE YOUR UNDERPANTS EVERY DAY
BT

Maybe that is a bad example. We are just having fun eh?

I chose to use the Nr. 2744 Luftwaffen key list simply because it was
the only one that I could easily read. Even though I use the M3 (NAVY)
modell, this key list works fine. There are many extra columns that
just don't apply. Use the rotor, ring and patch panel settings.
(Walzenlage, Ringstellung und Steckerbrett). I have not changed the
reflector settings. It remains Reflector B. You will find the
kenngruppen in my message.

I love how some keylists are printed with Gutenberg Bible typeface!

The Encrypted Message:

AUG 14 0630Z = 80 = DEC RNF

XEHXI YIBJH VKQTO ZBXVL OEHQB DYSOB KKUTM IPPET MAVKL
NBIWF OZQYP KEBXF PWECR MEOTK HZCXN IDFFQ

I will post a detailed explanation for decoding in separate post.

ok...Jeff (K8JEF)

[Jeff Spears]

Practice Message Explanation

The Encrypted Message:

AUG 14 0630Z = 80 = DEC RNF

XEHXI YIBJH VKQTO ZBXVL OEHQB DYSOB KKUTM IPPET MAVKL
NBIWF OZQYP KEBXF PWECR MEOTK HZCXN IDFFQ

Decryption:

Enigma    M3
Reflector B
Rotors    I IV II
Rings     F T Y
Plugboard AS BZ CJ DK FN GQ IW LP MO UY
Positions D E C         ;Type in RNF
OPE

Positions O P E         ;Decrypt message starting with second group
FMHQT OPARR ISCAB INBTT ASKBI CYCLE GROUP RECON
BETSI EVALL EYTRA ILCRY STALL AKEAR EABTX


Rewrite:

AUG 14 0630Z
FM HQ
TO PARRIS CABIN
BT
TASK BICYCLE GROUP RECON BETSIE VALLEY TRAIL CRYSTAL LAKE AREA
BT

I am going on vacation with friends next week and this message
says HQ orders the bicycle riders to go where my buddy's
Dad wants to ride.

ok...Jeff (K8JEF)

[Ronald Wells]

Very cool!  thank you very much for sharing this.  I'm having a hard time finding test messages to try out.  Using real German messages just adds way too much complexity for me at this point lol

Just figuring out the word breaks (in English!), assuming I correctly decrypted the message, is a major challenge for me!

If anyone knows of some sites that have test messages I'd love to hear of them!

Thanks,

Ron