Station X July
2, 1943
Dear Mr. Ericsson,
We intercepted a
message whose internal key we know.
But we do not know the external key. It's up to you
to discover it.
Mr newman
QEP16
8MVGQ84+XQSJE+XPM9ZY3TVSCRKQWQR9WCD/C3HEWEUUSD9YBP
JXTGZGGUC3SZF3WWVGAZQF/OCV4SXSOZ8CDRFBAIBIHZTC4KWS
DGK9/VWV+REGRJ83WKDOWTLDNGJY+DNGVPWLTOQINAQSYYMTLL
IMD3KUOVMMXQG4S+3UATJU3LWIJH/THS/L44EDDFRHBM+GUUEM
IRT988K+8MXVV94+NDAEN8RJ3ECJ4Z/CBYI34KIEUXX4FKEBRY
ZIU4BCEXNI4M3DEZXFIT8NWFDEFIIGOWYZCO9EDQOCARDGOJUN
9Z33+CUX+/8/K8V+33KLXASJKFFZ9YI8CKK3NSIKWYQWQQ/AG+
FEUQ/NMLSHV/QDYQNGL8BVEN/UDNZUK/KFVGFZCR9RQ/QYJYJF
NDRJJMBVMNPOH8LMUUPAMIGN4P9JX/C4MS3XOKM4EGYAAWBQ9J
+NTURWGNFMGH+L+T+/OM3F/LCIXFMSTV/XPV38CH9GC9AHJKY9
RD3HC8JFFWNWSHJFY+U8DH+JWXIRJJLH4NFPKFWAPZH/KM8NIF
KOUCGQRODQVEL4/SK8C93CPIW4+BKAOXT9GQC/HXT+SIQCFUPL
UUZFI3KQZPLTJGCPQO+3/+FWE8YBMMPV+GM8SUY8FOIZJ4HXE8
EA8YMSLGRBQWSOEIKLLGMQBFWEJU/YLVBXBX3RA9YGQV4KV3CA
UEPY4PTW4Y8Y89KHL+CJJTJAY+UDIPOP+UZINDSFO4O9VNRYSV
AF4NJS/NHRTPVEQODKOBATVFEYGA/WREKD4JPV88UZCE8IPMWY
OPNDFTQLNAB8WCI3OQARSLJITGIZRE3GC3CUBDZ94KMFLSIWDY
CW++H4TUQSTDSWB4TV8KHHF3AJELIN++9KWEESVD8IMYUCF/SD
K4/X3Q+BMC8TLH+HVRCVWHSI/ZKT9/8W4DN3TSVFSNRJKBWTXB
UMCWCETBRW8M+VKYXB9NX
...xxxx....xx....x.xx..x..xx.x.xx.x.xxxx.
xx..xxx.xx...x.x.xx...x....xxx.
..xxx.xx..x....xxx..xx.xx..xx
..xx..x.xx..x..xx..x..xxxx
.x...x.xx..x...xxx.xxx.
xxx.x.xx..xx..xx...xxxx.x.xx.xx...xx....xxxx.xx..xx...xx....x
x.xxx.x.x.x.x..x.x.xxx.x.x.x.x.x.x.x.
..x.x.x.x.x..x..x.xx.xx.x.x..xx.xxx..xxx...
..x.xx.x.x.x.x.x.xx..xx.x..x.xxxx.....xxx..x.xx
x.x.x.x.x.x.x..x..xx.x.x.xxxx....xxx...xxx.xx..x..x
x.x..xx.x.x.x.x.x.xx.x....xx..xx..xx.xxxxx.x..x....x.
.x.x.x.x.xx...x.x..xxx.xxxx.xx.x....x...x..xx.xx..xx..x.x.x