Left wheel is cipher wheel in entire MacArthur message , except in 

encipherment of key word 11Chaocipher". 

(I) ~ove ent of Letters and Wheels for Enciuherment 

Right wheel move'd one space counter- clockwise while left wheel is 

held in position. Then, on right wheel , second letter at right from Zenith - at the 

arrow - is moved to Nadir - red mark - and the letters moved up to 

the right. On left wheel , first letter at left from Zenith - at the arrow - is moved to Nadir - red mark - and letters moved up to the left. 

Movement of Letters and Wheels for working backWards. 

Turn wheel to bring letter, to be enciphered or deciphered , on (left) 

cipher wheel to Zenith. Move letter at Nadir to Arrow - one 

left of Zenith - intervening letters moved down one space . On plain ~xt wheel (right) , bring letter at Nadi r to Arrow - two 

places right of Zenith - intervening letters moved down. Then disengage plain text wheel and move one space clockwise . 

MacArthur Sueech 

Instructions to person to decipher - C is Z in instructions and nieans t he end of instructions. From P to C are t herefore the instructions and the private code is used . Start by having both wheels set up in A B C order. Disengage wheels and turn until 11T11 on left wheel is at Zenith; "A" on right wheel remaining at Zenith. No movement at t his point. Then start decipherment of instructions by turning wheels and 

bringing "C" on right wheel to Zeni th. ( CH-R) 

CH - AO 

CI 

p 

H 

E 

R 

z 

See other 

Right 

left 

right 

left 

right 

left 

r i ght 

(end of instructions) 

page for private code - a is - - b is -- Then start decipherment of message. 

Turn wheels to bring "V" to Zenith on left wheel, then use encipherment 

method as shown above (I). 

For original encipherment, at this point turn wheels to bring "B" 

up to Zenith on right wheel and t hen use encipherment method as 

shown a1::ove (I) 

--------------------------- ':lhen the position on the board is taken down, it is d ·me AFTER the 

movement on both wheels has been made . ~hen reconstructing in the 

middle of t he message, letters on wheels are arranged and right wheel is moved one space counter-clockwise as in I , then continue 

as in instructions in I . 
-

I 

lt.ac Arthur Ciph11r 

Beyond pointing out these gen 

At this point after all changes: 

N (plain text) 

E (cipher) 

Left: PZMYUHKINJBDA VFSOXT'·TLEQ.RCG 

Rig1lt:EUTKBZQ.POSNAWGVFYRCDLXHIJM 

My discussion to the generala A 

0 

t.dbxxY-li\'Hti!fC'ftefj9~2fl¥iJP;Ni@W 

Le ft Rtglirt: GQ.ES IJtiI-!NXHP ARVZ IBJLFKYODTC 

Right: vmtl>XC~OSGZEKTLPFJYHRMU 

Objectively assess the situat1 I 

B 

Left: 'Zll( HULTDGKMRFEQ.FVACIYJXBONS 

Right: XUVMWALITGEFQ.YJDCSKNZROBPH 

Comprehend something of Asia A 

K 

Left: N'ZWTSHCUIDKVRQ.FJPBIAGYXMEO 

Right: XJCW'KLHUIBGZFVPRYNOAQ.DSEMT 

brxcccaea cs• c MJI x im x ~kax;IZ••wwtlxl••gm 

Left: AKZWUYOGXEJF'l'RMQ.CDHIBSNVLP Right : KFUTSLNXODHBZCYRGVliQ.IEJPAM 

location to be certified 

SENTZ LONGE E 

c 

Left: RQ.HCDINBVLJFrKPWMAZUGOYXES 

Right: ZYR~~ITDEBKJVAMQ.FCLPUSOXH 

EEDAW NOTh'E W' W 

T 

l.ef't: DRZi:nXKTJWOPSALtnfiVFCHNBQ.I 

Right: IRQ.JUMKWNZTXSBFYHLVEDAPGCO 

TICAL FREED OMZ z 

K 

Left: GJYl-WOCFSNDALTXUKHWBQ.RPIZE Right:SFHHDTGIORCYUNLKWVPBEAZJQX 

The peoples or Asia now 

see dawn or ne!! opportunity 

Q and political treed.om Z 

-
. ' .\ 

~ i.:acArthur Cipher 

Pa5! 2 

Of tho normal. national.is ~ X 

Le:f't 1 SFIUBQL'.(RKJZGPDHEWXTNAOVYO 

R113ht iFVLGUHNDCIPEMKSBWRYJOQ.XAT'L 

Theo• political. and social oo 0 

z 

Left: ISQMPYAUFGHCRN30L2ETJXXWVD 

R113ht: REIDX3JKLVCA03NPTH~GYPUK1Z 

• 
-

I 

-

MAC ARTHURS SPEECH 

KEY FOR INDIC~TING KEY 

ABCDEFGHIJKLMNOPQRSTUVWXYZ 

HLRQKJOGZSFMDWTBXAYPVEINUC 

T L·C H R·A 0 L-C I R-P L-H R-E L· R R Z 

P M R G A/H T M R Z/ A B M G A/K M A A C/ 

.., 

Le:ft "fheel V 

T :J; 

.,.. 

ffi 

A 

0 

~ p 

® 

d> 

Below 1s notation of 

letters as they fall to 

nadirs on right and left 

wheels wMle enciphering Chao 1n MacArthur's spee Left Wheel Right Wheel 

\'( 

A 

M 

l' 

s 

x 

D 

T 

s 

E 

F 

K 

x 

B 

G 

L 

FX 

L 

x 

Distribution of letter on both wheels after last movements and changes. 

Right: LXEHIJMNBOPQGRSTUKVltfY'Z.AFCD 

Left: THXIWJKLADESNOQRUVYZMBCPFG 
CHAOCIPHER - THE ULTIMATE ELUSION 

Left Right Left Right Wheel Wheel Wheel Wheel 

(T) T u w 

H (I) I L 

I (L) w A 

(K) N L Q. 

K ( 0) M s 

T (Y) v . c 

(B) H c J 

(D) I E A 

N (V) 0 L 

(B) K D N 

Ringed letter is cipher Above is notation of letters 

as they fall to nadirs on 

right and le~ wheels while 

enciphering THINK THINK. 

Position 

at START 

. -

of wheels and letters 

,-s~ 

,;J ~ ~ 

Notation ' of letters on both wheels at end of THINK THINK 

was taken after full change was made on wheels • 

Enciphering first line of 11ALL GOOD" etc. was then begun. All other notations of letters on both wheels made before 

full change was made on wheels • 
C H A C G I P l--1 C.-- 'R_,