RES'fRIC'fED 

COURSE 

LESSON 5 

TEXT ASSIGNMENT 

.· 

REF ID:A66793 

NATIONAL SECURITY AGENCY 

Washington 25, Do Co 

Military Cryptanalysis, Part I 

Polygraphic substi tut::ton: four .. 

square and two-square ma.trices 

Section IX 

~. 1. Construct a digraphic distribution for the cryptogram below. 

Solve the cryptogram, and recover all keys. 

5 10 15 

A MK EA XP SO ZP LM Hr XN PR ~ EH HG RH 'GR ..!£.+ 

B 4 HU ZW VA :BD MD WO BU ZB XR ·DD m lUI GR CG HO 

c OO·ZB m w zo m ~re oo ~woo~ m ~ 

. D ; CP GR CC LU SD WS PR PX MD YG AM DF MH IL QB 

E CQ lO IQ PF GF ND :Bl PF CC VA U' CC CQ lO OZ 

F Rr OQ Vll• CG IQ KP DL IY AO HA CG BO PF GF .'TD 

C! CP AO Bk crv LF CC CQ YO QU OD CN OG CN WA QC 

B BT MH KQ '111' Le BU PB OT ID WQ OF WG ZO IG KG 

J : DL ZW VA ZB XR AU VA DH PF MH PF ZB OH WL CG~ 

. K ~HO I.Z SO ZB XN WS ZO IU TA AO GA HA EU MH YO 

! 

L :m E MH HU~~~~ m zo YG 00 u CP m 

M i ON MU WG R'1' CG HO Mii M3 PR C1.r MF U' CP KS RO 

N WZ MN QU CP AO HA CV . CO MR J:1l' DU· PF GF· NQ 1G 

0 QD IB ~ w· ZO YG BJ3 IOI ZN XR· LW JnJ IQ WS QD- DC 

P ZB m RM SO EN IA RU DW GR c:!G HO MH MS PR QD . ., 

Q 4 DC LZ TN WL KN PF X1) UT WA ZO 

REB'l'RIG'i?ED , Declassified and approved for release by NSA on 11-08-2013 pursuant to E .0. 1352\3 
REF ID:A66793 

RES'f'RfC'f'ED 

g. The following cryptogram is suspected tp contain the probable 

word REQUISITIONS. Solve it and recover all ke~. , \ ! • 

' I . I 

I 

5 10 ! 15 

A D:t ~ :XQ GY II KG IT 00 QC CJVIDE.KU DM RI RN 

B RO NK • KP DH cu RB PA I' QQ ·pr1 'OD ,CM lB HE MR 

c QQ EG LP ~.c IP OP LN SN DT DP l1r RS EM RN OA 

D QL OD DA Qc. TI'Z EM WK NK DC XP RK BT HE QR QU 

E ·BP LP LK NQ .IE SR HF SQ so QR CM QL BL ~ TX 

F GK KF CM Tr ~ RP IT BK MP m.. BC m Mr ZF RW 

G ZR CK CM DC VC OA UA QP RR IV' 1RQ PK TP CE QR 

K ~re oo ~ oo ~ ~ oo.CM n!HE ~ m b ~. I 

J r.r lW so EM DM qr RQ BK LG T.B I CE AY nr UC me , I 

AB C DE F G B I J K L MN 0 P Q R_ S TU V.W X Y Z · . \ 

A - - 1 - - 2 - ~ - - - - • - - - - -~ r.- • - - 1 - 'B - - l - - - - - - - 2 - - - - 1 - - -\~ • - - - - -

c - - - - 2 - - - - - 1 - 5 - - - - ~ - h l - ~ - - ~ D l - 2 "!' l - - l 2 - - - 2 - • 1 - - - .[. ., - ":' - - 1 · 

E - - - - - - , - - - - - ..... .. .... .·3 - - - - - - •• 1, , • - - -· . • 

F ~ - - - - - - - • - - - - - - - - - ~ ~ - - - - - - ... •• • o't • I ~ A -

G - ~ 1 - - - - - - - 1 - - - - - - - - ~ - - - - 1 - • ]' ~ , . . I . • .. 

~ H - ~ ~ ~ 3·1 - - - - - 2 ~ - l - - - - l - - - - ~ : · I ~ - :i -:i ~ - - - l - - - - - - 1 2 • - 8 2 l 1\,- - ~ 

·J - ~ ~ ~ ~ ~ - - - - - - - - - - - - - ~ - - - ~ - = 

. K - .. ~ ':' ~ 1 1 - - - - - - - - 2· - - - I- 1 - - - ·- ":' 

~ L - - ~·~ l - 1 - - - 2 - - l - 2 - - • j- - - - ... ~ -

M - - - - - ~ - - - - - - - - - 1 - 2 - ~ - - - - ~'- B - - - - - - - - - r .... '' - 3 - - - -. - 1 - - Iii - - - 1 - -\ 

0 ~ 1 ~ 3 ~ - - - - - - - - - - 1 - - - ~ ~ 1 - - - -\ 

pl - - - - - - - - - 1 2 - - - - - - - ~ - - .- - -·- ' ' Q - - 3 - - - - 1 - - - 2 - - - 1 3 2 - ~ 1 - ~ - - - R - ~ - - - - - l l - l - ·- 2 2 1 2 1.1 I- - - 1 - - -

s - ~ - - - - ~ - ~ - - - - 1 2 - 1 1 - ~ - - - - - - T - l • - - - - - - - - - - - - 1 -.- - i - - - l - - U 1 - 1 • - - - - T • - - - l • • - • - ~ - • • - • • ' . v - - 1 - - - - - ~ - - - - - - - - - - ~ - - - ~ - -

w - - - - - - - - - - 1 - - - - - - - - r - - - ~ - -

x - - - - - - ·- - - - - - - - - 1 - - - ~ - - - - - -

y - 2 - - - - - - - - - - - - - - - - - l - - - - - - z - - - - - l - - - - - - - - - - - 1 - ~ - - - - - -

RES'f'RfC'f'ED 

~=27 

2 

\ 
. 

REF ID:A66793 

.J:lBS'fRIC ':FED 

3 • 1I'he following cryptogram.,was enciphered by me~ 'Of an inverse 

four-square matrix.wherein the ciph;f" sedtions are normal aJ.phabets 

(I:J) inscribed in s~raight. horizo)ltals. Solve ,;it and recover ·all keys. 

A 

B 

c 

D 

E 

F 

G 

JI 

J 

_ lj. 'IO 

QU KF FT TO ·IP' "HI ··G'B ,. 'AD ·EB lFQ. HD ·GL ~AG .KI 

TO Ri> GJI so RH lFO 1w 'KI ., 

GO ·im. HD GU uu IP 

- ON MD RI ,. ME rso J1iU tMO . E'F ug, GI GL AG 00 

GH PQ GI FG ER -a I 1Jl> ~ rNL Ql> FQ QJ{ HD WG-•FG 

/ .. :NU TO· MB: U' OK GG ~ f.AH GQ PY XT :ez XT U' 

KY R!l' NE Rr UQ :ff IRK J'J'G ·DN us lD w 'PD HA 

OD .GT FZ IA FQ FF tm un (GJI. ·RI 'QC FQ AB: GQ 

. ' 

FU AR GQ PD DP TY i]J? JEQ !Ml SD m TL w KI 

RI l!)C -'l'O .. tu FA .'lW '1:1C "1m /lfi' 

"!.A'B c·n E F G H I J K L!!M1N( lP (.Q ~R ~s .T u \v w x y z •Af - -- 1 - - 2 3 -- .. ~ -Jl .... -- ... - --- ... -- - D - ... - - -.. - -- --.... · .. -...-.; ·-- ..- -- .... -· l' ·- -- - - ci I 

--- .. .. ---- --·- ·-~ 

...,,.. _____ -... - .. - - D - 1 -

' - il - ..... .n ..- ..... -- p-- .. ------... - -·- ~ .... _ - E - - - • 1 .. - ... - - ... - - - ...- Jl.ll Jl ...... ·• ·• -~ ..:. -- ~ 

F 1 - - - - 2 4 - - - ·- - . - ~.11- ti.. - - U 1 '2 :- -- ··- l; 

G .. 1 - - - - 1 3 3 .. - 2 · ~ + Jl - .:B - - 11 il ... ..... - - ·-! 

H 1 i · - 3 - - .. - - - ... - - .;,~ .. .... .- ~ ~ ... ...- ..... -- -- .. .... -.J I 

I 1 , - - 1 - - - - - - - - ' .. .t. · lJ. Cl!: ........ .- n - - - - - -~ . J; - .... - -· - ""' - . - - :- - - - !!:' - ........ -- .- .... ..... ... .... . • - . .....: 

. ~ ·1 1. - - - ~-1 - - i.. !- .. - - ~ - ... :- - ... :a - ... - ~ 1 ..: 

; - - J. - .. - - - . - ;. - - . - +.· - tB .- -- - ..... <2 - ... -· ·-- --

. - - - i 1 - .. - i i 1

1- - - - • i ....... ...-. - n - - --- . .._ -- -1 I t 

B - - ... - 1 - - - - 1

- - l - :-; - - - - - ...., n ........... -· -- ·-: 

0 - - - l - - - - - i• 1 - - ilt l - ........ - ~ ... .. ..... - - P"-: 

p - - - 2 - - - - l .., - -- - •t - - 1 .._, .... - -- .... ~ -- -~l ... ~ 

Q - - i i - - - - - - l - - -.Ii - - - .... .- ... n ..... ..... ~ ... ~ 

B-~-1-1-23-~---~----~-----~ 

s---1------~--- ----------- !' - - - •,• - - - - - - I- l - - - - - .... - _., 4119 .._. ..... 11 --, 

!

--1-------1--- -1-u~n----~· I ___ ,__ - -,!---,,- - - - -'- - - •\• - .... -.._ ... ___ .._ . ...f 

lo, ... ,,..... - ... - n '~1 - - ... - I... - - - - - - - - .. .._., ... ._• ... ~ ' 

x .. - - - ~ ,., .. - . - - ·- '.. .. - .. - .. - - ...... .,,,_ --.- -- ....... . y ~ - - ·--- - - -~- - -·~ - - - ' - - - -~-- .... -- - z - - - 1 - - - - - ·~- - - - - - - - - __ ............. ..... 

R:SS'i'RIO'i':SD 

~15 

EE 

WF 

MI 

FG 

FV 

KB 

Mr 

KA 
! 

I 

REF ID:A6679~ 

RES'f'RIC'f'ED i 

i 

I 

4. Solve the following cryptogram and recover all keys: . I 

i 

: 

5 110 

A WB IT ·HS SE SS NA EC PA Rl' iRG DO CP RO !1-.r 

I 

B TC EN LZ Rl' 00 9A DP EH I w·fil.'FN EO TS 00 

I 

c AD WB SP EN QC ov AS 

I BS VD PR NS RO QC CA I 

D ,. OG EN ZP QS WO PO PA Rr RG bN IS OE ·00! NR 

I 

I 

E '4 QC ZE WO OG EN z.p QS WB OP ¥Q RP IA BA EC 

I 

F BA EK ZT SQ PO l'T CN HA RT WP SU BS CA AB 

I 

G SS SQ DA SG AZ IA .cw HA IE tN RD SA IE :mr 

I 

B NA AC SQ SS SQ DA SS I 

NZ lE ~ OD ·cw lIA WO 

J AE KR TS HJ AL BW 

ABCDEFGHIJKLMNOPQB.STUVWXYZ 

A - 1 ~ 1 1 - - - ~ - - 1 - - - - - -l 1 - - - - - - 1 ~ B - - - - - - - - ~ - - - - - - 1 - .: l - • • • - - -

C: 2 - ~ - 1 - - - - - • - - 1 - 1 - -1 -·- - - 2 - - -

D 2 - .- - - - - - - - - - - - l 1 ... -.·1. - - - - - - - -

E: I - - 2 - - - - 2 - - - - - 4 1 - - -~-I - - - - - - -

F - • - - - - - - • .- - - - 1 - - - -1- - - - - - - - G 1 - - - - - - - - - - - - - - - - -r- - - - - - • - H 5 - - - - - - - - -· - - - - - - - .i

1

2 - -. - l ~ - - I 2 - - - 2 ~ - - - - -·- - - - - - - l 2 - - - - - -

~ - --- --~ ~ - --- - - - - - -·- - - - - - - - iq - - - - - - ~ .::- .- .- - - - 2 - - - 1\- - - - - - - - ~ - • • - l - • I ~ ~ • • • • • - • • :- ~ • - • • • 1 

M - - ~ - - - - ~ - ~ - - - - - - - ~ :-. - - - - -

B 2 • - - - - - a l ~ - - - - 1 ~ - - - - - - 1 

·O 1 - - 1 - - 3 .- - -- - ..:. - - 2 1 - - 1- 1 - 1 - - . . I 

~ 2 - - - - - - .'f"' .- 9 .. - - - - 3 - - - 1- - - 1 - - - -

.~ - • 3 - • - - - - - - - - - - - - - 2· - - - - q - - ,,. .. . 

~ ' - - - 1 - - 2 - - - - - - - • - .- ... .. . • ~ .;J -1 - - ~ I 4 - - - -

- :.~ii : f: : - - - • - - j .- -

:• l ~ ~ - 1 - 1 ~ - ~ - - - l - l 5 - ~ - ~ - - =fl'I.:- ~-a~~-- - ~ ~ - ~ ~ .~ - - - - - - ~ 1r~ - -

,.J. ~Uf ... - - - - ... •• .. • - • - - - - - - - - - • - ~I • - .. . .. 

"V1 - - - J. - - - - w. . ~ ... 

~ . it..~-,..,. :~ .~ ~~ - - - - - x; !- -- .,...- - -- .- ~ .. -

y. - ... - ~- ..... .,..- - --- _ ..- - - - - - - .- .... - =-- ~ . ...--.: - zt - -.. - ~- i1 .:- - -- -~ .!9 - - __ .__...-2--::· - ~ l. .... . -- ~-

~~ ~.109 :+~:24 

RES'FRIG':FED 

:4 

15 

GA 

"WC 

filL.. 

!!!...... 

OG 

~ 

BP 

PO 
REF ID:A66793 

RES'f'RfC'f'f!lD ; 

5. The following two messages were inter~~pted on the same radio 

link half an hour apart, message·"B" being in mp.ewer to a request for a 

service. Solve the texts, recover all keys, and determine the cause of 

the cryptographic error involved. 

MESSAGE u A" 

5 10 15 

A DS ZM CM GI QM AB VG ED SU XII TO SQ OR NR SB ,. ~ I 

B 4 PB QO HN TB LL Ql'J Q,9 SI CR lU' TQ cc KG AT FN I 

c YF VG .ED CG NU MO LL HP so SBI NP SQ OR. NB SB Iii 

D ~ CM MB ' RP OG LL lX CM GI 01! ~ so NQ LZ IC 

I 

-E FD YR VI OR SB I 

I 

I 

MESSAGE "B" I 

I 

5 iol 15 I 

A OY Rt1 PU KV TU WO lW LL :NR EVI VD BB BZ lZ NO Iii I 

·1 

'B ~ TD BS VO DE TS TY NV PZ SR: VB PM FW WQ XS 

I 

c SK lW LL PW YR CD DE lO ID NOi 

! YC BB BZ lZ NO 

I 

D ~ PlJ co UC ~ DE , ... SF" PU KV TUI WO m> lB DI DM 

E XL sz IV BZ NO 

REB'FRIO'f'BD 5 
REF ID:A66793 

RElB'f'RIC'fED . .. ..... 

6. I 

The following cryptogram, suspected to begin with the words 

AIR RECONNAISSANCE nEPORTS, was enciphered by means of a four-square 

matrix with four different keyword-mixed sections Soive·1t and recover 

all keys. 

5 10 15 

'A IC RO IK HC AA OU TC IH BO NR :t;ID TT CD FI LP I ~· 

B MS TD XA r;e EA OY TI PC 

I 

PF HC ~ RD TM XB us I 

I 

c CD MO EB 'IV BE GG r;e XA ND us KC SF EA OY KC 

PL. HC us LO NK PF 

I 

D BT m:. IG HC ND GC IX 1F RR I I I i 

E BE. GG ow m QI IL m NB 'I'r HG TM OU SC m· BD 

I ! 

I . ' F /us HS r;e so AR UF cs CA EH CF TS OE AQ HC TM 

I 

RU OE I 

G , AR NR OS· AQ LA DB XA IA Ci!T NK OG SF UI 

I Hj OE CB TY us HS AS TD HC AS CF TS OE AQ BD nc 

! 

J cs QI BR EK r;e so AR PN QE ME Nit RD UF AR NB 

I 

Kl UT RS GC SC GC m:. so BD ~ OR us HS KG m AS ·J SF CK HD BD TY 

I 

I 

{See distribution on following p~e) 

\ 

\ 

RESl'RICl'ElD 

6 
REF ID:A66793 

RES'fRIC'fED 

(Frequency distribution for Problem 6) 

-ABCDEFGaIJKLMNOPQRSTUVWXYZ 

~ : l ~ 2 =~~ : 3 i : ~ D 1 ------..... E21 

F 

G 

B 

3 

6 l 2 

J: 1 

J ~J. 

K 

L14 

M 

N 2 

0 

p 

Q 

R 

s 

T 

u 

v 

w 

X31 

y 

2 

1 

1 

2 

2 

1 2 

1 

1 

2 

4 

2 

1 

1 

2 

1 

12 

1 

1 

1 

2 

1 

1 

2 1 

3 2 

1 l 

3 

11 

1 

1.-

3 

·-

3 

2 

l 

3 

11 

l 

2 

-· --· 

-· - 11 

2 2 

6 1 

1 

l 

1 2 

2 

z'--~~~~~~~~~~--~~~~~~~~~~~~~~ 

R:SS'fRIO'fEID 7 
I 

\ REF ID:A66793 ,. 

! \ RES'FRIO'fBD 

(llLABK) 

RBS'iRIGTBB 

I 

I· 

I 

I 

j 

• . I ·. 

1 -

i 

I 

j/ 

. 

1/ 

I 
~ 

REF ID:A66793 

REB':FRJO':FED i Security Informatio~ 

NA!rIONAL SECURn'Y AGENCY 

W~hington 25, D. C. - . 

COURSE Military Cryptanalys1~ 1 Part I 

LESSON 6 Polygraphic substitution: Playfair ~ipher S)'Btems 

TEX!I.! ASSIGNMEl'f.r Section IX 

l. Solve the· tolloW!Dg cr)'P'togram and recover ail ke)'B,: 

5 10 15 

A UA SK UA SP .KM MR .IO OR IX YR· OR OS MS .SD ~ 

B • RR LV ,BR SA AK· SW u SA BG ·cw PN, cw XS :AJJ ~ 

c ..1fA :NM SM.·VU lB AR OR ·m1 RA RL SA m UK SA OR 

D MY IA AU BP MB SD UN .we AS EN CA BN DR FB NL 

E AS JUJ RF vu Ro M-1. BE RP ,NY IA cu GR WO ;SR IL.. 

F .JJ1 BU t;B UG DM XS:. ·MR .{!N HQ DM :00 RU SB ·we AS . ·. . - G UB EO AS AD. WB NO DK ~ F.e RH SP RW HO UC AD 

R FT NO SB AU RD or 'MS SD UN XB VL UA KS RQ ~ 

J ~ UA BB LV cu CW· FB N.L QO AR OR HG ~ 

RA LV AL 

K UB UA CE RB AD EQ YX OE XH UM SW PR FS ON UK 

L GN DR UP UR xw RW QII FR SD A& NO AD UA WB BO 

M ws IG FS IR UB CA uo RP AS Im \lQW :SH :NP :SS NA 

N UA OE RB BB RZ RO KR OR VB :NU us DR SR SP RW 

0 FR DA 

. (For distribution..( see p1J8e 2) 

" 
RESi'RIOi'ED 

REF ID:A667~3 

(Prequenc:r 4ietr1b11Uon for\ Problem 1) 

. I 

ABCDEFGBIJKLMBOP RSTUV~XYZ 

A 

B 

c 2 

Dl 

E 

F 

G 

JI 

I 2 

J 

K 

L 

M 

B2 

0 

p 

3 

1 

Q 

R23 

s ... 3 

T 

u831 

v 

w 

x 

y 

z 

22 

l 

RElS'i'RIO'FED 

5 1 1 1 2 l 

1 1 l l ~ 1 2 2 -

-

l 

.. 

1 - -\- 2 

2 

1 

-

2 

l 

-. 

l 

1 

3 

1 

1 

- -: 

-l 

2 

2 

'!" 1 

21 

1 -

l 

11 -l 3 - l 

l; -.":' 

- .:2 2 1 

2 -·-ll - - 11 

1 

-

... 1 

l 

l 

1 

2 2 

3 

2\-1 \-

\-

!1 3 

\1 

a 3 

1 

r- - - 1 

611 

to: 

I 

~ I 

i 

l 2 l l 

1 .-

ll 1 

~ 2 

1 

2 

2 

-; 1 

-12. 

i: - -1~ I 

·+;=31~ I 

I 

i 

I 

I 

I 

i 

I 

I 

I 

I 

--

3 

-·· -

3 

- 1 

1 

-. 

1 

3 ·- 2 

-

1 

l 

--·-

l 

1 

-

-

1 
REF ID:A66793 

RES'f'RIC'f'ED 

2. The following cryptogram is suapected to contain the word 

DIVISION. · Solve it and recover all ke~. · 

5 10 15 I 

A MP QK KA sz QK KA BX EH I 

·ll<i YS ND TP CQ OL NP 

B RC AH .IM SK ND m QK DU RF QK EH· LK YS ND TP 

c SA OE SY FR QP FE lB MO FD AF BJ RS· Du RF RN 

D TP CQ UT~ IM SK ND UD FM JE HR VN QK UD EQ LF 

E AK BB IY QV sM FO SY DY 

3. Solve the following cryptogram and recover all keys·. It 

is suspected that this ~ssage is signed nwmr:B.ROP COL INF." 

5 10 15 

'A ft.L 65 .4L c~ !V PV 7W xv zx B! DS 07 Lit- cw 4K 

B OF Rl' 4L 79. OL RR lN MR RM DQ QV 9R 6M ex 4K 

c QF 4B 4L 

I 

79 OL RR OP Elf. BR QB 4M XS w • NU 

.u / 00 QX 4K ¢n 5! NP Z5 4R 1H VQ PF RN 4L 79 OL 

E HR EM 8X 4! ND AP 

+-- ZJ: 4n xc M4 Rl' · P6 4M 5R FZ 

F 

I 03 R9 Q4 CI 2H xz 48 "!¢ L4 D PQ IM BR T4 PQ I 

o BQ RM D3 

I 

' I 

•: 

3 
REF ID:A66793 ; 

RESTRICT~ 

4. Solve the f'olloWing ceyptogram and recover tall keys: . I 

! 

XV D Q G YU US D F $RAZ WM D y!y :w tT Q :BL YU ZR B I . I 

KCKFU 

VZRAG 

BCGBB 

R QB U ;r 

LKVZI 

LRXQY 

YRBPU 

OZEUQ 

l:PBYU 

MDCOL 

YDFVZ 

QACQP 

CGKOF 

QUSPV 

PVKTO 

Q SR BU 

KBZWG 

SABVD 

ULPIP 

JVUUY 

WKVBA 

o.x v D v I 

EQTBV 

TRBLV 

BSUZK 

Rl!:8TRIC'fED 

I 

l'1 D C ·y W 

TXJYE 

OB AX I 

VKFGR 

BFGKF 

GP YRS 

»i R P V Z 

KBMVZ 

RRZBX 

VAUVD 

KQVRG 

I 

F X Z RiK 

I 

KV I nl·G 

u QB. LI y' 

·uxiQ/w 

TCUQR I 

I 

A R Z A! U 

I 

I 

u 0 s :R 0 

l 

I 

VPQUK I 

i 

v·K BYD . I 

UYPYR 

i 

I 

Q·X SR M I 

i PDIQE 

I I 

J X R ii: X 

i 

I 

i I I 

I I 

I 

I 

DYEUE 

BQKBY 

UZBEQ 

G :E' D Q L 

L G 11 A R 

y ]? y JI ·Q 

KKXSR 

OQFRG 

FJXVD 

QBMDC 

KV KS B 

CIPTF 

G Q Z R :a 

RBFXD 

N A Z rt V 

UIRSK 

DFKRK 

MBTWE 

XFYE'W 

XISRZ 

.Q G YU U 

OLK LB 

MGZRK 

QVTMR 

I 

\ 

\ 
- ---

REF ID:A66793 r 

ftES'fftlC'fElD 

5. The following c:r;yptogram is suspected to contain the signature 

"CLINTON COURTNEY COL INF. II Solve it and recover all keyso 

LHQEF IP X 0 E OPYQE NC 0 PC MAGZH EFQEL 

MC OBY FMEBO DKDYS YFQEL' E F D F H EFQET ... 

OLIEG GYHLO SLMLQ LBPJZ SPTFA OFQRL. 

DQELN HQEFF ?iIBTZ OFGWJ FOSLM DPYFQ 

ELBLY BYFQE LYFQE LLMSX LE B I· F EFDMQ 

\, 

EC F ZN LQEMF XSLMT 0 LID Y OADSF EOSQE 

. MLEFQ RQILU BPS TL MFHLM FIKQE FFYFQ 

ELTOL LGDYD TLQLB PKFAO FQROT PCQEM 

OSQEM LMBLY B G C•G Z r QR W. 0. OLSAP SKLLM 

ESZQR LKMOE S 1

:P SR N 

6. The following cryptogram is suspected. tq contain the probable beg~'1.ning "P.ARr ONE OF THREEWA.Rl'S." Solve it and recover ~11 keys. 

NBBVC QKVHI EBMMN BB VI I :B D L B K LSFXV 

' 

RKCBV MKI\YF QTBVR BVIYP ! YBVHB O· DB FT 

XEGRR· LWYBV FY I I K ,Tu c pH MWPYF YWRQA 

IBLHZ VGYUU YCAVE GHIRW 

' 

UVRPK RBDDI 

SYEAI ZNTIQ NYMWP YFYik KTSYU EQVXP 

U V l:' T F MRWIP YCVDD RFYG~ SMYCA VEGH I 

KGNYN LTBIV KRHFG L F L'f G ABYDP TIQNY 

YFQTB VIKNY CMVRP BP TL 'p IZYUK IEGDU 

TQFYB CYDPB NRVYV AYGOZ 

. RESTRJO'l'BD 

5 
REF ID:A66793 

RES'FRIO'fElD ..... 

(BLANK) 

RES'fR:ICtf ED 
REF ID:A66793 

H:BS!'fftleTEB. 

Security Information 

RATIONAL SECURITY AGENCY 

Washington 251 D. c. 

COURSE Military Or)'P'tanaJ.yais 1 Part I . . 

LESSON 7 Pol.1Sraphic substitutio~: large 

tables 

TEXT ASSIGNMEM' Section :tx 

· ' · 1. The following ·crwt;ogram is suspected to contaiJ:?, t~ probable 

word "RECONNAISSANCE." Solve it and recover all ke1a.. · 

5 10 l 

A SA CJ JY RO Hr tp LP IX> CV PS tJ.V PE GJ.lf BP SP 

·B FP LU qr LW PR. CJ.' ICL' RN QE RO C'i MF SE LZ QZ 

c RR AO TR SQ PG ·TL GL NR Q,S uz RX KK JE MV NL 

D w AR Q]!: SA· MW KK LP SL AP PZ ~ KK PB CJ JY 

E BL CJ BA co .AR mr u. jJI Qr RP' .AS SL RP SL m. 

t .. 

F QJ Qr AJ m. IG :NR wx AI BI YD RX JE CP lO SP 

G KO FB qr Q;E> 1P'MZ·so AM DZ kR FP sx PK !'J PR 

ll OE AK CE AS LP DO PB·. SI AX sx PB LP BT wx RF 

.J GZ qr IM PR CJ JY AK m JY AA :NN sx CB RO WE 

K SA BD LL ML AX AF 111 DC PK MS :NE QJ qr AJ 

(For distribution,\ see next: pQge) 

RESTRIO'F:SD 

l 
REF ID:A66793 

REB'fRIO'f:ED 

I • I 

. I 

(Frequency.distribution for 1Problem 1) ! • 

I ., 

ABC DEF G HI J KL MN b P Q. IRS.TU V W X Y Z 

A 1 - - - - 1 - - l 2 2 - l - l l - 12 2 - - - - 2 - - 16 ~ - - - - - - - 1 - - - - - - - - - ;_ - - - - - - - - l 

c - i • • 1 -.- - - 5 • - - • 11 -:P.- - • 2 - - - - 11 

D - - - - - - - - - - ~ - - - 2 - -·- - - - - - - - l 3 

E - - - - - - - - - - - - - - - • -1- - - - - - - - - - F - 1 - - - - - - - i - - - - - 2 -1- -. - - - - - - - 4 

G - - - - - - - - - - - 1 - l - - -.- - - - - - - - 1 3 

H l - - - - - - - 1 - - - -· - - - - ! - - 3 - - - - - - 5 

I - - - - - - 1 - - - - - - - - - -J- - - - - - - - - l 

J - - - - 2 - - l ~ - - - - - - - -1 - - - - - - - 4 - 7 

K - - - ~ - - - - - ~ 5 1 - - 11 -il - - - - - - - - 9 

L - - - - - - - - - - - 2 - 1 - 4 -I - - - 2 - 2 - - 1 12 

M - - - - ~ 1 - - - - - 1 - - - - -j - 1 - - 1 1 - - - 5 

N - - l - 1 - - - - - - 3 - l - - -1 2 - - - - - - - l 9 

0 - - - - 1 - - - - - - - - - - - ~ - - - - - - - - - 1 

p - 3 - - 1 - 1 - - - 2 - - -· - - -l 3 1 ._ - - - - - 1 12 

Q - - - - 2 - - - - 2 - - - - - 1 -: - 1 6 - 1 - - - 1 14 

-· R - - - 1 - 1 - ·- - - - 1 - l 3 3 -· 1 - - - - - - - - 11 

s 3 - - - 1 - - - 1 - - 3 - -.1 2 l - - - - - - 3 - ~ 15 

T - - - - - - - l - - - 1 - ~- - - j - - - - - - - - - I 2 

. u - - - - -.~ - - --- -j - - - - - ~ - - - -·- -.- - 1 l 

v - - - - - - - - - - - - -· - - - -t - - - - - - - - - - w - - - - l - - - - - - - - - - - . ~ I - - ~ . - - - 2 - - 3 

x ~ - - - - - - - - - - - - - - - ~ - - - - - - - - - - y - - - 1 - - - - - - - - - - 1 1 . ~ ! - - - 1 - - - - - 4 

z - - - - - - - - -· - - - - - - - ~ - - - - - - - - - -

Digraphic phi data 

4~ • 152 +~ = 33 ~5 = 184 

Monographic phi d~ta 

· ~ • 1471 ~r =i 849 

Initial ltrs: cl>o s: 1386 . Fihal ltrs: cl>o = 1096 

I I 

HESTRIGTED 

2 

•. 
REF ID:A66793 

RES'ffUC'fEB 

2. The following cryptogram is suspected to begin vith the opening 

words "WEATHER FORECAST FOR WEDNESDAY ONE THREE SEP.L'EMBER." Solve it · o.nd recover all keys • 

5 10 15 

A OL TS BM XD AW AU ST. ZF ·AW OL QJ· WD EM KB SA 

B OD WE WD 'l'G m KC VE JY DY QG BX FE I<K FP OR 

c IF OD RD HJ OB MH BG SK' VQ VQ OD QL . /Ul WR us 

D KK DO CA us· VQ OD DO n> VE MI Mii JY DY MI HX 

E BM ST m EI w VQ vc TS JOC XD MX DO CK SK !JC 

F us MH BZ lJJ CF xw BQ VJ oU JD IW 07 uo us NO 

G lll EC WD XJ JM VQ AI YD VE MI MP VR VE AP VQ 

B'. m Hr KW CK xw BQ HZ Bil HP CJ FS 'l'W OG zx IZ 

J AM AG JD m FE Mii ER VE OU 'l'W wn· JY DY BK RG 

,. K WF TO AW QW DO· OD VE JY TS WP oz Nr IW BX YJ 

L BZ KW CK DQ AM 

•,f_, 

RES'FRIO'FED' 

3 
REB'fRIO'fED REF ID:A6'6793 . . i ' 

3. The following ·two messages, intercepted on links known to be 

I • passing traffic enciphered by means of' random digraphic tables 1 ere 

believed to be isologs containing the ·probable signature "MAJ GEN CARTER 

WOMH!NGTON" •. Solve the texts and reconstruct the fragmentary table. 

Message "A" 

5 10 i 15 

! 

A ex n oo ~ u w ~mm m!m u m·m DE 

..-...--------------------------~-----1 ! . B 4 AY AM ex BD DZ JX VK DQ IY IG JO lG1 DE IG JX 

, 

C BR OU L1V SR SC DE UW QK VN LN ZH 1'M IQ DW KS I 

I 

D ~~ZR w ro DE~ OF~ ml~ w DE ro n 

E GS XJ :NZ '.NN IG OF NB SR ZH 

XF DE KW FH WX ?1I- PY RN AY 

I 

' JU ! TI AA GP DZ GP 

; 

AMI ER AJ UI sx ow I ---..--.-

G uw QJC VN m ZH ?M AV HW ow sc , JX OF ~ MO sn 

i ~ 

H 4 AY NR DZ CO IS SR ZR RT VF IQ! Vlf. FH TQ UT BT 

J EX FN XG IY IG OF lR JL OF OF: IA IG BT MO SR 

K-ll E ~ WX ® ~ OC 00 M 

L OP IH LN ZR TM SL SC OF GL 

Message "B" 

5 

i 

sGI SL MG ex ·ID VM I 

I 

raj r 

I 

I 

id I 

I 

15 

., 

A ~ n oo ~ u m ~ m m ~ m sc u m ~~ 

B .._m ER AJ OF ZlI WC PM SR AY NB KQ RI BR LD YM 

I 

C JO ED XG TI CO VU ~ UO KM r..:j: . JX EN MX Q)l' NE 

]). SC SR WX LR BK EN FW m' ·SL D~ '!.:.V CO WG ZT IG 

E NU DM DE AY PS ·XQ XQ TI LR J CX VF OF JL OF 

. F co HI IQ PC DZ CR Hll IY IG w~ ex BD KC UT FJ 

G Q)l' UO KM LI JX VU IN XS LI '()}f RI Dr SL VF IY ,_ I 

I 

H~ IG SC DE VF TI JX FL LW J¥ RC ER SX OW JI 

J AJ JX SR AY PS NR QJl GP PS JiV JI DT EE VF IY ~ 

K .....,m SL DJ PS KS JO SC DE IQ qH LI ER AJ VF TF 

I 

L me zz LI JX FG LI co LV ex cw 

/ 

~· 
REF ID:A66793 

RESTRIO'fED .... _~ 

~. Solve·the fol;Loving o~ogram e.nd. r~over ~l keys: 

l 2 4 5 6 7 8 9· 10 

A 003 315 ·, 097 114 34T 261 o67 217 314 241 

f 

·B 195 062 3~ 115 006 451 062 141 ot2 i.r2 

I 

c 189 192 Of8 ·400 189 o67 315 097 530 403 

D 115 393 ·~2 6o9 192 356 115 J.86 122 467 

E 212 071 074_ 237 235 11'4- 416 115 .393 271 

F ·055 293 le6 552 009 062 471 141 150 193 

G 186 516 184 266 274 ~70 002 238 053 186 

l[ 141 072 236 ' 516 189 004 i95 191. 479 o67_ 

'• 

J 008 397 08o 137 105 189. 391 262 343 4o8 .. ... 

IC 133 273 071 oSll. e74 4oo ;. 367' 223 4o3 186 

L 2ll 524 ooa· 29,2'. OU - 122 393 284 

( 

,t ·, 

' 

RESTH:KJ'FBD 
REF ID:A66793 

REfRRiC'f:SB - j . 5. The cryptogram below is suspected to b~gin: wit}?. the stereotype 

"REFERRmG TO YOUR MESSAGE" or "REFERENCE YOU'.R MESSAGE." Solve the tex;t 

and recover a.11 keys • i 

! .• 

1 2 3 4 5 6 ' 71 8 9 10 I 

A MRA DMr Q2! Y.IY MFG .NNL S* QFB -~ WII I 

B DSZ GNM IJA GOO LGI DEV' 

i 

~'.f'D QQ! nD WI 

C MMr JIU PNM VZP LGI DMY 

i 

~I POV GIP TGO 

I ' • 

D PLM MCH JP.B MRC OOK FWJ me EEF MOO DSZ I 

E TEN DGK FWI NNM !EV EZF T!As DIP ID·fr TDL 

I 

F GTR Q}ID MZU ROD NPC JNJ cf I !9!:! UZK LIY 

G NJN CWQ MZF VOD NWG PRG Nw URP MIA DGI ·' 

R VRG NRF lJHll PIF DUJ TDL Jk>J VRT DAZ lmI 

' 

J. IFX DGG DHV 

OZN 

ENG 

EIE 

VZP I 101 _EMF _ ___,JP,...· _c __ s_MK __ JIM_ 

I 

MND 

eJ • 

a• 

02. 

u o• 

ea • 

C• 

K PQW 

L ,. SMK 

M CRV 

N MRV 

P WR 

RES'fRIC'i'ED 

IJY IPJ DMD YJP 

JLF mr FNV FJJ 

TSZ TNM VRS 

I 

i 1IWI 

I 

/MI'R 

I 

I 

NOV GIP RMI' KQX --- GCJ /EW 

I 

CZY GPW XPA i I 

6 

NIPEl< ;;;;;.;;;m',__...;;JP.-,C~• 

OTT MOT EOW 

TEQ. VIN QJQ 

PR!' 

¢=1094 

i?= 981 

• </>= 794 

.. 
i 

REF ID:A66793 

RF.:S'fRiC'f ED 

6. The following cryptogram is suspected to contain the probable 

wotd "AIRCRAFT." The' encipherment is believed to involve a tetranome 

trigraphic system employing a matrix similar to that illustrated in 

Fig. 59 of the text, the ciphertext sections being composed of the 

dinomes 00-99 inscribed in the normal .mariner ·or writing, but the plaintext sections consisting of keyword-mixed sequences which differ from 

those in the text example. Solve the crypt~gram and recover all ke:ys. 

A 

B 

c 

D 

1 2 3 

o601 7849 4912 

024o 1245 4827 

5 . 6 7 8 9 10 

2533 1747 6o31 4270 8240 1877 6111 

1236 5681 6831 4214 9945 .1875 8917 - . 3309 4143 8843 5342 7719 1517 2774 3249 4507 4872 . 6o11 1266 ln45 7327 676o 5345 7619 5945 7349 3o43 ~ 

E 7709 2819 4322 0129 3875 27i3 3o46 9()40 0775 6561 

F 2911 2507 3576 1505 4214 9875 3570 0208 6583 6161 - .. 

G 3247 2107 1TI7 I 3918 .2533 1747. 0264 1956 1242 4707 

' 

H 7772 3296 3491 0576 0779 5514 1145 3143 8569 2871 t 

.. ·-... 

RES'FlH-fYif'BB 

1 
REF ID:A66793 

RE8TRIO'fED 

·-

(BLANK) 

RElS'FRIC'fED