Authenticating Device 

1. Retere.nce 1a made to rtlJ previous invention or a •11easage Authenticating S7atem• covered b7 u. s. Patent Ko. 2,oao,•16, 1aaued 18 11&7 1937. Said patent vaa proceaaed through tbe Signal Corps and tbe invention deacr1bed therein ..,1 be manutactured and 

used bf or tor the Government tor governmental purpoeea, vithout 

the p&JUltnt to me of ~ r07<1 thereon. 

2. The preeent invention baa a ra1Dl1l&r purpose but acoomp· 11shea 1t 1n a aillpler wa7, which vill be brietl7 deaor1b•d 1n 

the succeeding paragrapha, 1n connection v1tb Pig. l. 

}. A aeries ot 10-point cipher ttotore, l, or th• tJP9 

COllmODlJ eawlOJ'9d tor CrJ}>tOgr&ph1C purpoaea, are assembled 

"in caeca.de upon a ebatt, 2, in aome ke7 order. 'rh• uternal 

viringa ot the rotors are all dirterent and each rotor carries 

an 1dent1t71ns &Jllbol. A oom;plete c1l'ou1t through the aet ot 

rotors traverse• a path vhich is determined bJ the apecitic order 

1n vhich the rotora are at-ranged on the eb&tt, the apeo1tic rotatorr 

poa1t1ona in which the rotor• are placed, and the wiring or the 

rotors. The lett•band stator,, },, baa ten input contacts,, 4. a1x 

ot which are connected b7 plugs and jaok• to th• aiX contacts 

arranged 1n e.n arc on insulator strip. 5. A contact lever arm .. 6, pivoted at 7, aervea to eatab11ah contact t'rom b&tter1. 8, to one 

ot the six cont&cta, 9, on tbe atr1p, 5, and thence into one ot 

the input contacts, 4, or the atator, }. The current thereupon travereea the rotors, emerge• at one ot the ten contacts, 10, ot 

the right-band etator, 11 .. and thence returns to batter7, 8, 

through one or ten 1nd1ca t~ lamps, 12. Th• apec1t1c leap which 

will be 111um1n&ted v111 be detel'lll.1ned b7 the rotor setting and 

the particular contact made at the contact etr1p .. 5. 'thua, aa 

lever 6 1s moved to one ot the contact poa1t1ona, a certain l.am.p 

will be 1llum1ne.ted mom.entar11J~ another lamp will be 111um1ne.ted 

aa lever 6 11 moved to another contact position, and ao on. Thus, moving lever 6 through 1ta three top poa1t1ona aucceaaivel7 will 

oauae three lamps to be lighted 1uccesa1vel7. A reaoval cardboard 

strip, 1,, 1n the card-holder, 14, serves to 1dent1f"J tb• lamps and 

represent• another var1abl.e element 1n the kep.ng •1•t•. 'l'hus, with a given key and a specific strip 13, moving the lever 6 thl'ough the three upper poa1t1ona will eauae three lamps to be 11ghted, giving a number such as 759, tol' example. Moving the lever 6 

through the three lover poa1t1ona will 71eld a d1tterent '-digit number, tor example 63~. A oonnection-cbanging plugboard •7 be 

inserted between the r1ght·band stator, 11, and the bank or 1nd1-

cat1ng lampa# tbi• serving to take the place of the variable 

cardboard atrip l}, or aa an additional variant in the a7stem. 

4. The method or using the device ae an authenticating 

means 1s as tollova. It ia the usual current practice tirat 

to encode the telegram 1n the Bank's private code or elee 1n 'm. a::J.- 8-~Ll-4 

~ /0~¥V: 

:Z/f 10~ 
REF ID:A67673 

aom..- other au1table oo4e. The teat group 1a then compoaed, baaed upon cut&in teat •l-nta 111 the teleigram. aa arranged b7 preagn_.t; 4110JS1 tu b&.Dk• con.oerne4. !be teat group 1• 

ua•ll7 a nuaerioal POllP or tvo or three 41g1ta, vhioh poup 1• than looked up 1D the code and 1ta letter- poup equ1v&lent. 1• aet dovtl aa the tia&l group ot the meaaage. All th• toregoing procedure ,,.._in• unchanged 1n pr&ctic1ng st invention 

except that the ccmpoa1t1on or the il\118t-1cal teet group is 

accOJIJ)liahed b7 the •chine d1ecuaae4 herelll. Thia part ot the 

operation vt.11 now be d.e•cribed. Having tb• •oh1M at ban4• 

the d&117 kef 1• •et up, consiating or the apeo1t1c order in 

which the rotor• are aeaellbled on the abaft. The t1rat tvo 

rotor• are aet to the aerial nUlllber or th& •••a&&•J the next 

rotor 1• ••t to indicate vbat currenc7 1a 1D.volved (dollars,, PoUQ.4a, •to.)J the next aiX rotor• are aet to ooneapon.d vS.tb 

the amount ot aon.,. to be checked or &uthent1cate4, au rotor• 

pro-.141.ng tor all amount• fltoa l to 999,999. P1s.. l shove th• 

rotor• ••t to ••a&p aerial number 35, and to the 4uantit7, 

u. s. $9,756,125. (Additional l'Oto•• •1 be provided to take 

care of other t••t elements, auch ae the 1Q1t1al letter or 

letter• or the MM or the b•ner1c1ar1 ot th• tranater.) It 

tbe t•l•gr&a tran1tet~1ng $9,756,125 is so~ tr°" lev York to 

London, tor exaaple, ~n the switch lever 6 •T be moved., b7 

P19•sP• ... nt, through ti. upper three position• aucoese1Te11, J'1•141nl, ff>~ nuple, tM autbeat1cat1Dg sroup 759J U' the 

telegna 1• going from London to lev YOJ'lt, the ev1tch lever 6 .. ,. be moved '1lroug..'1 the lover tbr•• poa1t1ona 71eld1ng. r~ 

•DIJPl•• th• poup 6,ft. Thu• the auth•ntiMtirc group 1• 

ditte,..t,, depencli.q upon the •••1• aerial number, the 

curreno7. the &al()UDt 1nvolve4, and th9 41r•ct1on or th• tranater, 

On •ch 08.7, atnce a ditterent J)el'INtat1on or rotor•. a ditferent 

plua1Dg Al'l"&na ... nt at the lett•ban4 •tator1 aa4 a 41f'terent 

oa:rd ca.a be •plop4, tbe teat nmbez. vould be ditt•rent. The 

teat nl11lbet- vould then be encoded •• usual~ b7 reterence to the 

codebook emplofed. fhe number 759 might be F•pr••••ted b7 the 

code vord RO:UP; 6311 b7 P?LYD. 

5. Bo meau are ahovn 1D Fig. l tor aut~t1call7 angularly diapl&cing the rotors during a aingle teat "11t the addition or 

auob ..ans 1• v1th1n the aoope and torma a part or th• 11l••nt1on. 

6. ~be bank rece1v1ng th• telegram &tter the ueua.1 decoding 

ot the oOde •••s•, note• the test data &net the teat group contain•4 thel'ein. It then ••ta up it• pluga, oard sti-1p,, and 

rotors accor41ng to the da.117 key an4 then &11gna the ~otora to 

correspond to the teat data ~r1e4 bJ' the telegraa. Upon operating th• lever 6 1t Will obta1D exactl7 the eame teat n\Jllber Vbich 11 eonv•1•4 bf tb• tel•gram 1t1elt, thus att••t1ng to the 

authent1c1t7 ot the transfer •• vell as to the aocurac7 ot th• 

;/,;J J J:. ;:;; %' ~ *~ 

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REF ID:A67673 _ __., r ,... __ _, r~r .., A 

amount, 1haotar as the latt•r 1• posa1ble, cons1der1Dg tbat 

10 x 9 x 8 os- T20 &r.rerent teat groups 1a the nexiJlna nmber 

obtatnable trom one ke7 aetting ot the rotora and thei-e are 

10 •1111on amounts vb1oh ean be set up. '?h111. however. 1a e. 

teatUl'e vh1ch 1• unavoidable, 1a ComlllOll to all teat!ng •r•tema 

ot this t11.ture, and does not vitiate the a~tea to &DJ' aer1ous d.~~e. 

* * * .. • 

I believe tb&t I am the inventor ot tbe device dlaclosed 

1n the toregoing aheeta. 

8 June 1944. 

* * • .. * 

I have read and understand the above diucloaure. 

/~19t/'f 'CJ te} 

to~ (f1? I te) 

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