Station X September 25, 1941
Mr Masters
We have deciphered a
message on the line of Salonica.
We think the same message was sent back on the Athens
line. This gives us a very long crib. Your mission,
if you accept it, is to decipher the message that
follows the first
message we already know the plain
text.
Peter Ericsson
The plaintext
MITTE9SEPTEMBER9WAR9DIE9ROTE9ARMEE9NACH9DEN9FURCHT
BAREN9VERLUSTEN9GEZWUNGEN++N988SICH9AUF9EINE9VERTE
IDIGUNGSLINIE9HINTER9DIE9DIVNA9UND9DEN9DNJEPR9ZURU
ECKZUZIEHEN++M988MIT9DEM9ENDE9DER9LIQUIDATION9DER9
SMOLENSK++A88TASCHE9ERLANGTEN9UNSERE9ARMEEN9IHRE9B
EWEGUNGSFREIHEIT9ZURUECK++M988DIE9GENERAELE9FORDER
N9EINEN9ANGRIFF9AUF9MOSKAU++N988DAS9JETZT9++RPP988
KM9VON9DER9FRONT9ENTFERNT9IST++M988ES9SCHEINT9SICH
ER++N988DASS9UNSERE9GENERAELE9ANGESICHTS9DER9ENORM
EN9VERLUSTE9DER9ROTEN9ARMEE9EINEM9VORSTOSS9IN9DIES
E9RICHTUNG9NICHT9STANDHALTEN9KOENNEN++M988UNSER9FU
EHRER9IST9NICHT9IHRER9MEINUNG++N988ER9WILL9DAS9IND
USTRIEGEBIET9VON9DONBASS9EROBERN++M988ER9SIEHT9AUC
H9DIE9MOEGLICHKEIT++N988DIE9SOWJETISCHEN9STREITKRA
EFTE9ZU9BEENDEN++N988DIE9DEN9AUFTRAG9HABEN++N988DI
E9UKRAINE9ZU9VERTEIDIGEN++M988SEINE9ARGUMENTE9FUER
9EINEN9GEPANZERTEN9VORMARSCH9NACH9SUEDEN9SIND++N98
8DASS9DIE9VERSORGUNGSLINIEN9DER9ZENTRALARMEE9AUF9E
INER9FLANKE9VON9MEHR9ALS9++IPP988KM9EXPONIERT9WAER
EN++N988WENN9DIE9OFFENSIVE9IN9RICHTUNG9MOSKAU9FORT
GESETZT9WUERDE++M988INFOLGEDESSEN9BEFAHL9ER9DER9++
WM988PANZERGRUPPE9GUDERIAN++N988NACH9SUEDEN9ZU9ZIE
HEN++N988UM9SICH9DER9++QM988PANZERGRUPPE9DES9GENER
ALFELDMARSCHALLS9VON9KLEIST9ANZUSCHLIESSEN++N988DI
E9NACH9DEM9UEBERQUEREN9DES9DNJEPR9NACH9SUEDEN9AUFS
TEIGT++M988AM9++WTM988AUGUST9ERGRIFF9DIE9++EM988PA
NZERDIVISION9DEN9STRATEGISCHEN9PUNKT9DER9BRUECKE9U
EBER9DEN9FLUSS9DESNA9IN9DER9NAEHE9VON9NOWHOROD++A8
8SIVERSKYI++M9999
The cipher text
P3/TX3KMZVBBHPKX8QHUBC9XJP9Z4+EDGFZTTAIUQY/BR84HH4
AXDB+HKO8YKWTGTJRG+8LTTKEVVHO38WMNYUWZDFUO9/YVDH9S
OEGO++DFCSA+ZCC3/Q94+NOEIBDM4S84T3PW8IT/UMLVR4FBTF
3QOX938GKS3//G8CGIEFVVLDVPCM3SKDA93ZADIQADK8T9BBRS
88XA+RNZW/NZ4ZXU8DJ/XXBQNJNVUXULP3KNAO8/TEDLAJPEPX
C/3C3LNVFVJ+OY98ZXVFK9QXWKIRIROCHCN8TUN3UGYI4FTY9H
KDHGBBRSADGVFRBN+NSRDQIGG+VJILQV+AH+OJ9V/JLZGHNENI
JI4AFIP8QHNUOP8RNQJ4NQQFVFT8Z9JZ4R3DV4JEGHGMW8FQWA
ODPL9O/TGXFL393I+ZG9RAEELISRQFANG+ZFQO4VWJG3YNILI8
XMI9HPPH/KEMLFDO8+QJQAIHCB4P3/9LQZLHSI8ACYO9HNSIFE
+HCF3JYVUSJGCVWWB9RVIGFEPJYRIA9K39W9MKDMPTZH/+DNV3
//JITEEOLLM3VXLUK+YUAYAAL/+4KRHW+BQJHYOSHRN4HV/FYU
V4J3HO/TXQIHJFTVMJBGFTFE8PKBCQ9CEDBD3YAK4M/8GXGPTF
FIMULD43+843CN8RZOWMUKPVH4KH/QCQM+EA8FK3PKYP9LJUM8
4Q/FJIS4EAUDQ9WRF+JBOMEHNY4DRC8VQIPB+LZMQQ+EGBMNMZ
ZZ3MPU9W3Y9IKASZ4JETCLLZIZ3AI/4VC+PFUOZPSEYRNZT983
+NX4TA/8/WHUU9EIMPDE434HXGU3KVB89DV4QZIUY9QQI/8WQP
KUDNYGRW+JH3COODU/O983YW9BVJ9M3AWRBBZDXJLY9GMIJ/+T
F3BQVK8HV/LADQPZZCI4O/A/EBDY+THOQ8IZAC4ZUYOUA8+IVD
AYIDRDSEI3Y/EIXEHLYHO9933XSMGCZK/DSCXKN4UZ4E8F+WEE
HABSWHMZTEXJ+EH3+Q+/OZCE3VD+RWSOOPDC8VHOLNQBRQBLWL
MCALNRSKDGPRL3AJ4JUYZKRUBJGUBRY3NPV3+PU88CXV84HR8Z
NQKAL+V8QWW4KY99+3KX/ZMHSTT8BRMGXF4CDEF9WZUWH8LTKV
NORGKKBXNNG+/KRE34MBOK/34CISHSREPAUWXLDYAOGGCMCPAT
TEOQ9WZQ+4ULKHON49VENXYHWUQQRAZNLZIDMDAFZ3WSNUEHZ9
UGCRCADWH+TTWPTRXQFWQFPFAWR4A3VMYPPZ//QR43ZOCKKELR
T+JK+D+PTF+WCJBBX9JNASCADYZ8WP3ZGU+JUL3GE43KYPE9NT
R3BN/KBHIDKTBBVXMCI/8XQPEJDJMKJJACGCVKWNVBHH3UVII4
RDHWHHXGORMS3K+CREJNLY/IOYC3NNFEH/C/9MKQ9KRHUPBJDX
ZE+ELGMIT4C3BZLXMWH/JGTTZ9CAJGCFHCDGHIPLKGZDHRS/NN
ON+QBWYLDCH8BJJ8DMXBR/3QHK8+C8XLIIYVVGNMUXN8PWAZOB
ZOZU8SNKENUEJAGKJGTUEXWSQEKHYUZ94O/IONVGXDGT+Z39JY
XNZEYD8XOXG3NH4GMXM/R++MRDEVV4SATW3QLHLQTEA9AS+NYK
CO9QOW48LQMNYCGUOMYQ3BNF8BUUJJ39EGOXU8S8XZVQK4BRAV
FIHTVNAYEWNZN4GND3NE339XA8VG8OEUT4DBQHLTF8BD+L/ZTJ
P+YUMULCDN8YGKP4NLGOV3XEWIPSKRPQCPQRQY+QYJVJG3ALI8
9TFUMOUKXCRHOFLLN4B/ESVE9IUEC48RUTSIHRC4/N+LWL499G
XU3RJWXIROBI9AOEURP88LSFOPKIZGZWC389JA/NIN8DM/AKEQ
ISAWPWSXTCI4DFZCDQLC