NATO UNCLASSIFIED NATO ---- a S S HERMES and Details of It and of the the of and It of Details and HERMES S U TANDING GROUP GROUP TANDING N ~ ~ R to R Gvna Nlsr "A"

DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE jjBflaS- ae 1 Pages frhr td o tepolmo incre of problem the of study further a .; 17 S.G; upon: agreed have and Machine Cipher Combined be possibles be general and in particular to provide means for the encypherment of of encypherment the for means provide to particular in and general O SCE traffic. SECRET TOP 8Ags 15 . 1952 August 18 S.G. 171/4 171/4 S.G. EOTB T3CMUIAIN-LCRNC ORIAIN SECTION COORDINATION COMMUNICATIONS-ELECTRONICS TH3 BY REPORT rcdr fr t introd its for procedure modification is known known is modification key lists of a new type. new a of lists key 3. The United States and the United Kingdom have agreed it will will it agreed have Kingdom United the and States United The 3. coe 15. a n 1952. October can easily be m be easily can the notch rings. notch the set, a in in Machine Cipher Combined the of security the enhance To 1. These entail the preparation, production and distribution of of distribution and production preparation, the entail These . Th 2. 1 4 4QU»«W « » U Q 4 . /4 - - PLAN FOR FOR PLAN . rcdrl hne a dsrbd nEcoue "B". Enclosure in described as changes Procedural b. a. To introduce HERMES HERMES introduce To a. which rotor a of design The d. a. An electro/mechanic An a. . Th c. 1 8 e Pg rvsd yCri. 9Ags 5) O 52) August 19 Corrig. by revised (Page incl. . United States and the United Kingdom have n have Kingdom United the and States United O IIm A IINm TO A N e increase from ten to twenty of the number of rotors rotors of number the of twenty to ten from increase T HE EMPLOYMENT OF THE CO THE OF EMPLOYMENT HE a FACTS BEARING ON THE PROBLEM THE ON BEARING FACTS de to both -C.C.M. Mk XI and C.C.M. M k III. This' This' III. k M C.C.M. and XI Mk -C.C.M. both to de NATO UNCLASSIFIED NATO ---- a S s HERMES and details of it and of the the of and it of details and HERMES s u TANDING GROUP GROUP TANDING n ~ ~ r to r gvna nlsr "A". Enclosure at given are ction T (C:^CS 15/6) HE PROBLEM HE . T O to the the to OUET DESTRU DOCUMENT - 1 T10 EFFE0HVE L0NGER a on l modification to the maze which which maze the to modification l i T i i t r c c c O T A M m a f sing the security of the the of security the sing or NATO Communications on 1 on Communications NATO or M w BINED CIPHER CIPHER BINED ill permit rotation of of rotation permit ill O—SEGRET — TO A N COPY COPY C TI M O o n AC fEMk ÿ 3., . 3 ÿ k M jflE N o w completed completed w H 53 5 . INE DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE which implements the measures described above is attached at at attached is above described measures the implements which — - — nlsr "C". Enclosure 1952. use In conjunction with the sets of 10 then in force. in then 10 of sets the with conjunction In use . lnfr h em the for plan A 4. netk retyte p the urgently undertake the of procuction as far as and soon as channels crypto CCM elcig h poeua hne b Otbr 1952. not October 1 by changes procedural the reflecting of of October 1 effective cryptochannels CCM NATO all for introduced be fetv 1 Oc 1 effective on all NATO CCM crypto channels as'Soon and as.far as production production as as.far and as'Soon channels crypto CCM NATO all on allows. equipment . t s eomne that: recommended is It 6. CCM's all to made be should that? concluded is It 5. t c e qimn allows. equipment he h rings on 1 May 1953, issuing sets of 10 such rotars for for rotars such 10 of sets issuing 1953, May 1 on rings h d. Rotors with rotatable notch rings should be introduced introduced be should rings notch rotatable with Rotors d. a. The ''HERMES'' modification described in Enclosure "A" "A" Enclosure in described ''HERMES'' modification The a. Enclosure "A" the COM's M k III held by NATO forces. NATO by held III k M COM's the "A" Enclosure a. The above conclusions be be conclusions above The a. b. The United States and the United Kingdom be ashed to to ashed be Kingdom United the and States United The b. NATO all on sets 10-rotor replace should sets 20-rotor c. . h proce The b. h pa eald nEcoue "C". Enclosure in detailed plan the "B”. Enclosure in described changes procedural lists key selected distribute and produce prepare, To b. c. To start the introduction of rotors with rotatable rotatable with rotors of introduction the start To c. (3) The necessary rotors and Aey lists to implement implement to lists Aey and rotors necessary The (3) (2) The necessa The (2) (1) The necessary Aits to modify In accordance with with accordance In modify to Aits necessary The (1) o t e 1952. ber d ural changes described in Enclosure Enclosure in described changes ural NATO U N C LA S S IFIÉP 0 0 IFIÉP S S LA C N U NATO S N O I T A D N E M M O C E R p loyment of the Combined Cipher Machine Machine Cipher Combined the of loyment r CONCLUSIONS ovision of: ovision r y instructions to promulgate the the promulgate to instructions y u sed for NATO Communications Communications NATO for sed a pproved. " T c n “ c a B" should should B" DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE .. 171/4 S.G. i t a c i f i d o m C'j Mk I ad I, ed ocs th r e d n u forces, y b held III, k M and II k M h t o b CCM'Sj a m m o c e u s s i be n d. A m e m o r a n d u m s u b s t a n t i a l l y as i n E n c l o s u r e "D" h ereto ereto h "D" e r u s o l c n E n i as y l l a i t n a t s b u s m u d n a r o m e m A d. ae i f i d o m are d e d. e M o kt f kits n m ber ber N tos n Supreme Comadr, nrec e r on mmanders, o C e m e r p u S and ations e in accordance with "A'L e r u s o l c n E h t i w e c n a d r o c c a n i d o r C CMs M k III, III, k M CMs C r t ake steps to e n sure that all all that sure n e to steps ake NT—6CORET ■NATO— e ir ir e ipt of the the of ipt DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE w C.C.M. Adaptor'will be amended to BID/O8/3D. C.C.M.*s Mark II II Mark C.C.M.*s BID/O8/3D. to amended be Adaptor'will b has C.C.M. modification machine the of After kit a of means by achieved be will modification, rotati tw fitting nUÜ ITikie inOUDÜ" in a carton containing: carton a in The modificatio The been carried out, the ivorine label is to be fixed to the adaptor, adaptor, the to fixed be to is label ivorine the out, carried been ite graphic completed and returned to the Distributing Au certificate Distributing the to modification returned the and and completed destroyed, be must Instructions on appear m n m T y oiiainhs bee has modification folloxtfing forms the in be will certificate (S1GROD or CSP 17OO> will also be modified. be also will 17OO> CSP or (S1GROD otn. eal o te et t b ae r gvni pedx "A". Appendix in given are ;be to made tests the of Details routine. a e are otb ehnc nls ta o e than less in mechanic a by out carried be can S.O. S.O. novs hnig oe lcrcl icis Dtis f hs changes. these of Details circuits. electrical some changing involves ihwl b sple t odr o sae f n pr machine. per one of scale a on holders to supplied be will hich n crypting live traffic cryptographic personnel must carry out a test test a out carry must personnel cryptographic traffic live crypting 2. The C.C.M. C.C.M. The 2. 1 . M 3. 4. Modification ,of the C.C.M. Mark II (SIGROD or C.S.P. C.S.P. or (SIGROD II Mark C.C.M. ,of the Modification 4. 171/4 o . The CCM Mark III Adaptor (BID/O8/3A) is to be modified by by modified be to is (BID/O8/3A) Adaptor III Mark CCM The n of the rotors. This modification, known as the HE the as known modification, This rotors. the of n - m m o has to-day been modified to BID/O to modified been to-day has t BID/OO/ "It is hereby certified that BID/O that certified hereby is "It o new pawl assemblies designed to change change to designed assemblies pawl new m he modification instructions. After the modification has has modification the After instructions. modification he dification of of dification . ahktwl b will kit Each s. 4 springs springs 4 n she instruction 1 1 2 1 1 ioie ae ' label ivorine gauge ass pawl new kt wl b tetd s ertrgsee crypto registered secret as treated be will kits modification certificate modification 3 D Drawing Copy Copy Drawing D ... HRE) MODIFICATION (HERMES) C.C.M. M n r I dpo mdfcto i il e supplied be will kit modification Adaptor III ark carried out and before the Adaptor is used for for used is Adaptor the before and out carried t he C.C.M. Adaptor is a simple operation and and operation simple a is Adaptor C.C.M. he NLSR "A" ENCLOSURE e e e n mblies are ou carried e 4 - e ar a serial number number serial a ar (BID/O t No..has 8 / t the short title of the the of title short the been destroyed." been 3 8 D drawing) D 8 / 3 t / GCCRET O » W D Serial Number., Number., Serial D hority. The modification modification The hority. 3 T S R C g g — Q W I A Serial Number, Number, Serial A n e hour. After After hour. e t w he order of of order he hich will also also will hich M R p ES ES arts arts 17 OO) OO) DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE akII nApni "" Atr oiiain h sot ils f the of titles short the modification After "A". Appendix in III Mark uhrt:. . . Authority: C.S.P, C.S.P, nameplates nameplates certificate in the following form will be submitted to the Distributio the to submitted be will form following the in certificate SIG the of titles sd nte rporma transmitted. as cryptogram the on used possible sending traffic in the old C.C.M. cryptosystem during the the during cryptosystem C.C.M. old the in traffic sending possible drses h addressees e encrypt be cry cryptosystem. In order to minimize the dislocation of traffic, traffic, of dislocation the minimize to order In cryptosystem. should be held over until it can be encrypted in the HERMES HERMES the in encrypted be can it until over held be should Th "33". Appendix in given are list, it will be encrypted and. an appropriate date-time group will be be will group date-time appropriate and. an the encrypted jfl&oup be differs before will date-time it list, transmitted originators be the will If 1952, day. October, 1st date the bearing at 2hus f 3 of hours whenever 12 delay last to originators with made be should arrangements cryptosyst decrypti or encrypting for used be cannot .. 171/4 S.G. 9 the that so 1952, r e b m e t p e S 30th on equipments more or one test hnevr o HER to changeover ,cryptosystem. . M . C . C old the in encrypted s Otbr 15, xet ht t es oe qimn sol b left be should equipment one on least at possible as that early except as 1952, tested and October, 1st modified be should equipments SCEMH p togra 5. Once the C.C.M. has been modified for HERMES working it it working HERMES for modified been has C.C.M. the Once 5. 6. After 0001Z hrs. 1st October 1952, no traffic Trill be Trill be traffic no 1952, October 1st hrs. 0001Z After 6. 7 . Posts with more than one C.C.M. available should modify and. modify should available C.C.M. one than more with Posts . 1700 p register number.....has today been modified to AFSAM 25 25 AFSAM to modified been today number.....has register i pronl r th are personnel hic I i her is "It e e o ASM2A rgse number...... " register 25A) AFSAM (or w .'s d in the NATO NATO the in d m using the key for 1st October,'1952, or the message may may message the or October,'1952, 1st for key the using m hich have been provided separately. A modification A separately. provided been have hich a emr ta oe ... av C.C.M. one than more ve t hus modified modified hus R M 0 ES can be effected without d without effected be can ES D t ASM2Ab afxn t temcie new machines the to affixing by 25A AFSAM to ODS th September, 1952 unlegs it is certain that the the that certain is it unlegs 1952 September, th e by certified that C.S.P. 1700, (or SIGROD), SIGROD), (or 1700, C.S.P. that certified by G eneral Cipher System. No cryptograms cryptograms No System. Cipher eneral w l e cha be ill e e - 5 - 5 - ae s hs fr h CCM Adaptor C.C.M. the for those as same tests to be carried out by the by out carried be to tests n a e t FA 5 te short the 25, AFSAM to ged ilable. Otherwise, traffic traffic Otherwise, ilable. n g messages in the old C.C.M, C.C.M, old the in messages g T A N e lay. The remaining remaining The lay. r f om that of the key key the of that om O -OEienC r e n e e n T DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE modification has been carried out, an encrypted request will be made made be will request encrypted an out, carried been has modification m which the re-encry the which Shoul m not for unmodified sd o te is encryption.. first the for used prpit etra aetm gop Te re rgntrs date originator's true The group. date-time external appropriate C.C. old the in a request will re-enc will request a HE the n i repeat a for ti point of bisection used for the second encryption differs from that that from differs encryption second the for used bisection of point dfcto s ona psil a possible as soon as odification m gr e d 8. Posts with only one C.C.M. C.C.M. one only with Posts 8. n tafc encry traffic any o pwl e encry be will up M cryptosystem, . p tion is carried out and giving the mes the giving and out carried is tion o re than three days to cater for incoming traffic traffic incoming for cater to days three than re r y R cytsse. rpoete rciig such-,- receiving . Cryptocentres cryptosystem. S E M p p on day the for key the using message the t p ted and care will be taken to ensure that the the that ensure to taken be will care and ted C.C.M old the ted, in f 6 ter OOOIZ hrs. 1st October, 1952. 1952. October, 1st hrs. OOOIZ ter a vailable should carry out the the out carry should vailable . be received after the the after received be GEGRET — s age an an age DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE S.G. S.G. will be used for tests of the CCM's held by submarines. by held CCM's the of tests for used be will encrypted on the machine. CCBP CCBP machine. the on encrypted the CCM Mark II, other than those held by submarines. Rotors CSP 2811 2811 CSP Rotors submarines. by held those than other II, Mark CCM the Machin Cipher et fr C ak I; FA 31 oos il e use be will rotors 3910 AFSAR III; Mark CCM for tests » m m oo arneet given. arrangement rotor test: each For 2. 3. 171/4 s dnia ih ht ie n h.ts data. the. test in given that with identical is 1. This test routine Is to be carried out on every Combine every on out carried be to Is routine test This 1. ih ht ie nte t the in given that with . o ts 3 ch 3, test For f. zero. to counter the Set d. a. Place the rotors in the machine in accordance with the the with accordance in machine the in rotors the Place a. b ni te one gvs h aporae reading. appropriate the gives connter the nntil 2, and 1 tests For e. . e te ahn t EN to machine the Set c. b. Set the the Set b. . Test 2. (Machine at ENCIPHER) at (Machine 2. Test e oiid o HE for modified eutn oo Alignment: Rotor Resultant Rotor Alignment Alignment Rotor Arrangement Rotor Alignment: Rotor Resultant Alignment Rotor Arrangement Rotor Connter Reading Reading Connter Test Connter Reading Reading Connter 2 Cekte lgmn o te oos nte machine the on rotors the of alignment the Cheek key (2) Repeat) and (Blank "Rnn-out" the Operate fl) ' Using CCBP CCBP ' Using Using CSP CSP Using CSP Using Using CCBP CCBP Using PEDX"" OECOUE "A ENCLOSURE TO "A" APPENDIX 1. (Machine at ENCIPHER) at (Machine 1. r C. tr t te oo ainet given. alignment the. rotor to otors C A 3 T Ä M (EMS ADAPTOR (HERMESj .M. 2811 2811 TEST ROUTINE TEST 0311 0311 e R ck that the resultant plain language language plain resultant the that ck E okn bfr ay ie esg is message live any before working MES 031 7 - 7 - , AFSAR 3910 3910 AFSAR , 3910 , AFSAR e t data. st I rotors are to be used for all all for used be to are rotors I C PE o EIHR s appropriate. as DECIPHER or IPHER 2YGCB C G Y 2 - T - Y - X D X W ~ 6R - G D R - - A - 12R 1 - G " D D C B 7 Appendix "A" to to "A" Appendix n E 1OOO d for tests on on tests for 750 c K K 8R 3 losure losure 4 D r G F I G V z 9 lOR " A" E- 5 d

DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE .- 171/4 S.C-, * W decrypting. hen carrying out Test 3 with C.C.M. Mark II, blank o blank II, Mark C.C.M. with 3 Test out carrying hen eutn PanLnug - . - Language Plain Resultant * a Test (Machine at DECIPHER) at (Machine Test a * LO ' ■ QLCOV MODIFIED ADAPTOR ABCDEFGHIJKLMNOPQRSTUVWXY2 ADAPTOR MODIFIED IS THIS YIII XIPVF YMPSI HGMEP AGHWQ 2QKGC JFHPM BQDQW MXOIQ MXOIQ BQDQW JFHPM 2QKGC AGHWQ HGMEP YMPSI XIPVF EW JUBWVËBFR JC MI TI T VTSIS AMMIY GJYCW BWFBR WSVJË EJVE JIUFB BEWWT KJBEC QOAIV BÏNTH JEBOC PGYPK MSRGU PGYPK JEBOC BÏNTH QOAIV KJBEC GF QYXGZÏ PHO GCZGÏ QMYAX QGMFB H H NQ2IQ NVE3P BNEPI CSBVV JSCPF JSCPF CSBVV BNEPI NVE3P NQ2IQ H M Rot oo Ainet p V T N p - D Alignment Rotor 1 Uig CPo1, FA 3910: ÄFSAR o311, CCBP Using (1) (2) Using CSP 2811: CSP Using (2) e ihr h floig groups— following the cipher A o TEST MESSAGE TO CHECK THE ACCURACY OF THE THE OF ACCURACY THE CHECK TO MESSAGE TEST Arneet 5 R 1R 7 2R 5 - Arrangement r C g. MAWFT M2AOF M2AOF g. MAWFT N T OCCnCT ■NATO pedx A to Enclosure."A" "A" Appendix L n FEI ISSMB ISSMB FEI c e before before W BBPW BBPW 8R A DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MIS E EN LECTURE PUBLIQUE HMia iB - - pedx B to "B" Appendix - 9 - iiÉBe «HMMHifa— and the No. 4 ro 4 No. the and ACP 233). ACP step rotor the at wiring the in made be to are th so pattern stepping rotor block (see actual wiring diagram and plate 4-1 ln CSP 1802 B or B 1802 CSP ln 4-1 plate and diagram wiring actual (see block ACP 234). ACP oto te tpig f oo No.,1. rotor of stepping the control .. 7/ Ecoue "A Enclosure 171/4 S.G. cont stepping rotor the at made be to are changes oeae yrtr o 2 wl cnrl h sepn o rtr o 5? No. rotor of stepping the control will 2) No. rotor by (operated se culwrn diagra wiring actual (see ih) n cnet t o emnl 5. terminal to it connect and right) 1. General - The purpose of this modification is to change the the change to is modification this of purpose The - General 1. . Mo 2. . Mo 3. en free the solder, Splice, right). to ag ie o th to wire gauge 5 (reading from front to^rear) and connect it to terminal 2. terminal to it connect and to^rear) front from (reading 5 si (reading from front to rear) and connect it to the right-hand right-hand the to it connect and rear) to front from (reading d o tria 5. terminal of e a. Remove YE wire from t from wire YE Remove a. b. Remove the WH wire from terminal 5 (reading from left left from (reading 5 terminal from wire WH the Remove b. a. Remove OR wire from the right-hand side of terminal 2 terminal of side right-hand the from wire OR Remove a. . eoe h B ie rmte ih-ad ie f terminal of side right-hand the from wire BL the Remove b. d d WIRING MODIFICATION FOR CSP 1.7OO AND SIGROD 1.7OOAND CSP FOR MODIFICATION WIRING ification Procedu ification fcto Proce ification d t f h ie tni, n cnet t o emnl 1. terminal to it connect and it, tin wire, the of or stepping contact (operated by rotor No. 4) will will 4) No. rotor by (operated contact stepping or PEDX"""T ECOUE "A11 "B" " ENCLOSURE TO APPENDIX e WH wire. Strip 1/2 inch of insulation from from insulation of inch 1/2 Strip wire. WH m for for C.C.M. MARK II MARK C.C.M. d a ure for SIGROD - The following wiring wiring following The - SIGROD for ure t the No. 1 rotor stepping contact contact stepping rotor 1 No. the t r S changes following The - 17OO CSP for e GO an IGROD a nd tape a 2-1/2 inch inch 2-1/2 a tape nd e rminal 1 (reading from left to to left from (reading 1 rminal d figure 14 in SIGLIL-1 or or SIGLIL-1 in 14 figure p j l r i occncr c n c c Njflarei' o ing contact terminal terminal contact ing a ct terminal block block terminal ct p iece of 24 24 of iece " DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE ment of TOP TOP of ment s follows: as ecie i aarp bel 4 paragraph in described described in paragraph 5 below, is to be used used be to is below, 5 procedure first paragraph The in described messages. SECRET and CONFIDENTIAL RESTRICTED, of encryption of each message. each of encryption entails only o only entails .. 171/4 S.G. uii iwmr m w i m uuuimi 2. Keying Material Keying 2. General 1. of the Key list (i.e. one month). one (i.e. list Key the of indicators which remain in force for the life of the Key list list Key the of life the for force in remain which indicators 3. The appearance of the above data in a C.C.M. Key list is is list Key C.C.M. a in data above the of appearance The 3. (i.e. one month). one (i.e. £. Two rotor-setting tables, each effective for the life life the for effective each tables, rotor-setting Two £. d^ . Two 10-letter random groups for each day. each for groups random 10-letter Two d^. system below - and - SECURE five and SECRET TOP Two a.. . al oo arrangement. rotor daily A b. data: following the contains list Key The describe herein are procedures Two etr nec cell. each in letter c. 2-0 etr hc ru fr h above. the for group check letter 26-30 A S ECRET ECRET n ecpemn o ec esg. Th message. each of encipherment e 1 T (1) 2 Tbe cnan a lgmn lte i ec cell. each in letter alignment an contains 2 Table (2) FOR SECRET-AND-FOR TOP TOP SECRET-AND-FOR FOR BELOW MESSAGES, BELOW m sae. h scn rcdr etis super entails procedure second The essages. RXLBA XNABU FU UAIBG PFBUC a SIMPLEX PROCEDURE FOR C.C.M. FOR PROCEDURE SIMPLEX LOJFX ZKOSE ble 1 contains a rotor number and an alignment an and number rotor a contains 1 ble SYSTEM INDICATORS SYSTEM o w, is to be used for the encipherment encipherment the for used be to is w, ENCLOSU 1 - nlsr "B Enclosure - 10 - R MESSAGE "B" E TTWHL S ECBET d S Te is p first The . . only oecRcr c R c e -o ^ o F M w WT GCOnCT TO fW e second procedure, procedure, second o te encipher the for r ocedure, ocedure, " DE CLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MIS E EN L E CTURE PUBLIQUE R D F etc R L E 1 T S S.G. 171/4 171/4 S.G. T l - nlsr "B" Enclosure - ll - e w w a a i f B j 3. A B C r ï r 12 DATE t. The procedure used in encipherment.in used Theprocedure t. a. The specific CCM cryptosystem used for encipherment andencipherment for used cryptosystem specific CCM The a. S The system indicators identify: systemindicators The 4 M D R A 6 A B D F etc. F E D C G B A Q, ystem Indic ystem B O 1 H D C 1 9R 2 2 5 Ö ' ' G M O U R 0 7R S 7R C B V H B W J R3 R 9 3R2R 4 ■7R A 2 6R 1 2 AR Î (For use in super encryption only) encryption (Forsuperin use '5 ■ARRANGEMENT ' SECOND LE SECOND ' A X E U ROTOR DAILY N 9. A E 6 6 1R 3R C 7R ______a . N . j F K 6 D N 8 1 P 1 l S 9 tor 4 P 9. E 9 S T 8 L ECOND LETTER ECOND TABLE 1 TABLE 2 XO VKIGT/TYOBK LXLOA LT COCTP 26-30 R T CK. TER AWNIW/MHSOE o 1 No. ' RANDOM RANDOM ' r u R G c o ^ o m n t a n - o GROUPS KPQ AISTQ/MKWPH ^ - S o 2 No. F/RCKNF t c r q c o DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE message classified TOP S TOPclassified message and SECRET-and-below, classified each message For u groups of theofme groups fied SECRETCONFIDENT fied from the fice groups listed under "SECRET-AND-BELOW". For each For "SECRET-AND-BELOW". listed under groups the ficefrom We ... kI i i s, eoeecpemn s omne, th«e commenced,is encipherment in before is IIuse, *When C.C.M. Mk se of either second procedure, .. 171/4 S.G. ig h is rcdr, sse niao s eetda random selectedat isindicator system a thefirstprocedure,sing ncincnrle tre o "R",to turned controller fnnction rotors must be adv berotors must f n jlAijfr.fini l ce. h systemindicator The ected. . is rcdr. ehdo nihret of Message of Encipherment Method Procedure. First 4. message indicator and is phoneticized and transmitted in cl in transmitted and phoneticized isand indicator message arrangement. (This arrangement can be checked by the 26-30 theby checked be can (This arrangement arrangement. numbers and alignments found in in found alignments and numbers theas is known group This abbreviation.recognized or a a word as the second to sixth groups of themess of sixthgroups to second theas r ihte8h te4hwt h 9hadte 5ththe 9th and the thewith 4th 8th,the 3rd with the 7th,the 2nd the with 6th,the letterwith 1st the by pairing etrcek) . check.)letter row isreached,row cell a in fonnd been thathas one is cell ain fonnd rotornumber rotor the and column,the second the row.and the designating theofdigraph letter first the 1, Table No. rotor-setting sequence. intermediate theas known are letters 10 resultant The indicator. otisa vial rtrnme, sue. fte n f the of endthe If isused. rotornumber, available an contains hthsaraybe eodd tenx cl otergt which right,theto cell the next recorded,been already thathas *d. The daily 10-letter Random Group Random 10-letter daily The *d. b, The rotors are arranged according to the daily rotordailytheto according arranged arerotors The b, . ieltes r coe t adm Te sol o form should not They random.at chosen are letters Five a. _ Theare rotors c_. f. The cell corresponding to each digraph is located in is located each digraph to corresponding cell The f. e. The intermediate sequence is formed into five digraphsintofive isformed sequence intermediate The s sage. a nced once by use of the "BLANK" Key with the "BLANK" Key with the of use byonce nced I t AL orRESTRICTED AL he first cell in the same row is resorted to. is resorted samerow the in cell firsthe E RT artdCRET, the encrypted using therefore t he two groups listed nnder TOP SECRET is SECRET TOP listednnder groupstwo he a ligned to the letters of the ofmessage thelettersto ligned i s transmitted as the first and lastfirstand the as stransmitted 12 t he cells are recorded. If a If recorded.arecells he a ge. - - “-ü Q T t / N T C n C C g — O T A M N D o. 1 is enciphered.is 1o. t herefore enciphered herefore Enclosure Enclosure w ith,10th. the u c e e " B ar s " Classi err e DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE fied TOP SECRET TOP fied ♦When C.C.M,♦When .. 4 / m S.G. ncincnrle und o "R". toturned controller fnnction rotors must be must rotors B W « «B M which the message is then enci is then the message which form a word or a recognized recognized ora aword form which contains an available rotor number, is used. If the end the If used. is number, rotor available an contains which the6th,the 1stwith the by pairing digraphs fiveinto formed 26-30the by checked be can (This arrangement arrangement, themessage.of groups sixth to second the as clear ragmn adainet hsrcre rmTbeI Ti is This I.Table from thusrecorded alignment and arrangement of the row is reached, the first cell in the same row is resorted is samerow the in cell the first reached,is row the of ain fonnd been has that oneis cell ain fonnd number rotor Ifa recorded. are cells thein fonnd alignments and numbers rotorthe and column,the second theand row the designating T rotor-setting indicator. in transmitted and isphoneticized and indicator theasmessage h esg oo ragmn n esg oo lgmn on alignment rotor message and arrangement rotor the message 5* to right, theto cell the next recorded, been already that has cell the10th.5th with the 9th,the the with 4th 8th,the thewith 3rd 7th,the 2nd with theintermediate are letters 20 resultant The enciphered, check.)letter sequence.. d Bt h 0lte admgop o 1adN. 2are and 1No. No. groups random the10-letter Both *d, *£. The rotors are rearra are The rotors *£. . ieltesaecoe t adm Te shouldnot They random.at chosen are letters Five a. c. rotor thetodaily according arranged are rotors The b. S f. The cell corresponding to each digraph is located in is located digraph each to corresponding cell The f. e. The first ten letters of the intermediate sequence are sequence intermediate theof letters ten first The e. cn rcdr. ehdo nihret of Encipherment of Method econdProcedure. The rotors are aligned to the letters of theof letters tothe aligned are rotors The Mk II II Mk a dvanced once by use of the "BLANK" Key with the with "BLANK"Key theof byuse once dvanced s nue bfr ecpemn I cmecd the commenced, Is encipherment before In isuse, a ble No. 1, the first letter of the digraph of letter thefirst 1,No.ble O U LASSIFI C UN TO A N - IB - IB- a bbreviation. This group is known is Thisgroup bbreviation. p n hered. e n lge codn o theto according aligned andged T U- CCTCT 'UL-O ATO M nlsr "B" Enclosure M essages Classi essages m essage DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE ftgB r W O «ftttgaBfr— M mor m 3OO groups, the maximum number which may be encrypted using any one any using encrypted be may which thenumber groups,maximum 3OO m *Whën C.C.M. Mk"*Whën in"useT,II"is the commenced, is "before encipherment ncincnrle undt "R".toturned controller fnnction oosms eavne neb s fte "BLA theof byuse once advanced be rotors must essage indicator. The same message indicator must never be used for used be never must indicator same Themessage indicator.essage e thanone message, mess ragmn an arrangement fonnd in the cells are recorded, regardless of repeats.of regardless recorded,arethe cells in fonnd designating the row the designating rotor-s 20th.the with 15th the and with enacmlse orcl. uig hs encipherm this During correctly. accomplished been intermediate theof as.part them recognizing on who, operator enciphered groupsare These followed, 2Oth. the tol6th by.the rearranged.are theynot but formed into five digraphs by the 11th with the l6th, the 12th thethe l6th, 11th with the by digraphs fiveinto formed text.cipher a sue o nrpig h etr Z.letter the encrypting for is used bar spacethe and letterX the encrypting foris Zused the Kay use, deciphering theto check a to provide these positions in ihr etaent enciphered. textnotare cipher in is Ill the CCM Mk. 2$ when letter the encrypting for isused spacebar the in isuse, II theMk. CCM text,when intermediate and sequence intermediate theof l5th letters theto the11th sequence, is assured that the first phase of decipherment has decipherment of phase first the that issequence,assured 5. ' The length of messages or the cryptoparts will be limited to limited be will cryptoparts the or oflengthmessages The ' O H W a *£.. j , . The rotors are realigned to the letters thus recordedthus letters the to realigned rotorsare The j,. .` h scn e etr fteitreit sequenc intermediate theof letters secondten The h. ` 1 Te pcsbtente rus f theintermediate of groupsthe spacesbetween The ,1. ge is enciphered. The result is known as the intermediate the as isknown result The enciphered.isge k. 'The intermediate cipher text is enciphered preceded by encipheredpreceded istext 'The cipher intermediate k. Length ofMessage Length i. The cell corresponding to each digraph is located in is located eachdigraph to cellcorresponding The i. h 1t, h 3hwt h 8h thel8th, the the13th with 17th,the The rotors are r are rotors The e tting d T alignment thus recorded from Table 1 and the1and Table from recorded thus alignment a ble ble No a nd the second the column, and the letters theand column,thesecond the nd NATO UN 2 tefrtlte f the digraph of letter the.first 2, e arranged and aligned according to the to according aligned and arranged 1 «T 14 - l4th l4th N K" Key with the with Key K" with the19th with nlsr "B" Enclosure e t f the of nt e are DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE or RESTRICTED must fee must orRESTRICTED enci group. The classification of TOP SECRET messages need not be encipher be not need SECRET messages TOPof classification The group. procedure after the first process of decipherment has b has decipherment of theprocess first after procedure proce filled in with Z and sodecrypted.Zand in with filled ed sinc ed any spaces which appear in the intermediate cipher intermediate thein appear spaces which any S. 6. 7. d . Decipherment. 9. rsbti should noted beit but ures e it is indicated by t byindicated isit Encipherment of Message Classification of Message Encipherment Bisection aibe pcn ilnt e employed. be not spacing will Variable Spacing Variable Bisection Bisection h casfcto famsaewihi SECRET,CONFIDENTIAL is which a of message classification The Decipher m ent is merely a matter of reversing the abovethe reversing of a ismatter ent merely w l e e illbe p hered immediately after the bisection thebisection after immediately hered m he ployed. syste - t 15 a ntecs f h O SECRET TOP theof case the in hat

m - Enclosure Enclosure - i 8çcj indicator. 9 r-s y m n AO GCGRCT MATO test test t e r c c o o e en shouldbe p e rformed " B "

DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE wnrnPMiiii— iiftQifc. S.G. Marie1952.1 on October to HERMES modified beIII, will * Rotors 3* discontinued on 1 October 1952.1onOctober discontinued reserve in view of the introduction of NATO General Cipher.Generalof NATO introduction theofin view reserve permit,facilities production soon'asas reserve aswar duced as soon as production facilities permit. facilities production as soon as duced notice.furtherso until remain Lists Key 2. 171/4 permit, facilities production soon as temporarily suspended on 1 October 1952. They will bereintro will They 1952.1 on October suspended temporarily . Machines 1. All C.C.M. Machines, b C.C.M.Machines, All f. The following Key Lists will no longer be held aswar beheld longer noLists will Key following The f. . Rotors b. Rotors a. pre be will Lists Key following e.. The c. The following Key List is effective now but will bebut will now effective is Key List following The c. bebut will now effective are Lists Key following The b. Lists Key following The a. d. The following Key Lists will be prepared for use asuse for prepared be will Key Lists following The d. ACP's ACP's 253. 252, 236, ACP's C' 27 254, 247, ACP's ACP's ACP's ACP's ACP's C' 2, 2, 235. 229,228, ACP's Period ACP's 244 -246.244 ACP's Period PLAN FOR THE EMPLOYMENT OF THE C.C.M.OF THE EMPLOYMENT THE FOR PLAN ÂO ASSIID cccnirr r i n c c c IFIED S S LA C N U IÂTO 237 238 - 243.- . rings) or AFSAR 3910 plus AFSAR plus3910 AFSAR orrings) AFSAR 228 nntil now 1 May 228 CCBP CCBP (rotatable notch rings)(rotatable notch , , 229, 03 03 229 1953 _ II or AFSAR orIIAFSAR II plus CCBP IIplus o th Ma , 2.5 nntil furth nntil 236 30 236 _ nlsr "C" Enclosure _ April 53 April r a , , -I (CSPand 1700 k-II re effective now and effectivewill now re 252 252 391 03 O o QE0RET ro W e II-I (rotatablenotch II-I rnotice p are d for retention retention for 39 S IO-I G0) and1GR0D) DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE * Or earlier if rotor production p production rotorif earlier Or * .. 171/4 S.G. ACP's 247 and 254 when these Key Lists are availabl are Lists theseKey 254 andwhen 247 ACP's eiinwl emd eadn tertr o betoused with therotors beregarding made decision will A ~ rings) or C or rings) ~ 2811CSP or 0211 CCBP Rotors ç. e. Rotors CCBP 0213 or CSP 2813CSP or CCBP0213 Rotors e. (rotatablenotch CCBP O211-1 plus CCBP0211 Rotors d. TfT ■ Period 1 July 1953* tantil 1953* 1July notice. further ■ Period C' 253 ACP's ACP's C 25 2426 . 244-246 235, ACP ' s Period Now until further notice further until Now Period Period now until 30 Jun 30 until now Period notch rings) notch 235 2426 . , 244-246 17 - QIŒ I ‘Q S e 81pu FA 941 (rotatable 3914-1 plus2811P AFSAR rmits e 53* N T C R G D Q O T A N jü E O W n lsr "C" closure e for issue.for T C a r C C G DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE modified in accordance with Enclosure "A". Enclosure with accordancein modified that ensureallto requested areIII, CCM'sMk for kits modification of: provision the urgently nndertake MEMORANDUM FOR: All Member Nations except Iceland and IcelandLuxembourg except Nations Member All FOR: MEMORANDUM CCM’s both Mk II and Mk III held by forces nnder their command.are their nnderforces by IIIheld and Mk II both Mk CCM’s Group approved-Group that: ingenei’al Machine t in particular and e .. 171/4 S.G. n ihret fTPSCE tafc o theStanding on traffic,SECRET of cipherment TOP NATO CCM cryptochannels as soon and as far as production of theof production asfarasand soon as cryptochannels CCM NATO Enclosure "A" the CCM's Mk III held by NATO forces.by NATO held III CCM's the"A"Mk Enclosure . Th 2. plnn detailed inEnclosur detailed plnn on all NATO CCM cryptochannels as soon and as far as production production faras as and soon as cryptochannels CCM allon NATO 3» Member Nations and Supreme Commanders, on receipt of theofreceipt on Commanders, Supreme and Nations Member 3» of the equipment allows.equipmentthe of allows.equipment 1 October 1952.1October 1952.October1 effective should be introduced for all NATO CCM cryptochannels effective cryptochannels CCM allNATO for be introduced should CipherCombined theof security theenhance to Inorder 1. hne ecie nEcoue "B".in Enclosure described changes Commnnic NATO forused CCM'stoall be Shouldmade SUBJECT: Plan Plan SUBJECT: ECC - EMCCC . a. the necessary kits to modify in accordance with in accordance tomodify kits thenecessary a. b. The necessary instructions to promulgate the proceduralthe to promulgate instructions necessary The b. proc The b. i ooswt oaal oc ig sol e introduced shouldbe rings notch rotatable with Rotors hi Cm 1 should setsreplace 20-rotor c. "A" in Enclosure described "HERMES"modification The a. the necessary rotors and key lists to implement theimplementto lists key and rotors necessary the e United States and theUnit and States United M SACLANT C SACEUR _____ a inCCHANNEL chine e _ ua ch dural fo

r the Employment of the Combined Cipher Combined the of theEmployment r ENCLOSURE ENCLOSURE e a "C". gsdsrbdi nlsr "B" in Enclosure described nges __ nlsr "D" Enclosure " D o " provide means for thefor means provide e d Kingdom are r are dKingdom 0 rtr sets on all -rotor ig GCGR NifgO e a quested toquested tions e< E T DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE fa Bng -iiiwci«Bunngi Cipher Machine (CECS 15/6)) are requested to replace page 1 with the 1with page toreplace requested (CECS are15/6)) CipherMachine Corrig, to S to Corrig, enclosed page 1 enclosedpage 19 August 1952 19August o nau Holders of S.G. 171/4 (Plan for the Employment of the Combined of (Plan theEmployment for 171/4S.G. of Holders . ■■ifai'Bo in a a nd to destroy the removed page by burning.by thepage removed to destroy nd /)1 l O UNCLAi TO A N NOTE BY THE SECR THE BY NOTE ODR FSG 171A S.G. OF HOLDERS CORRIGENDUM to the E TARY r r DOCUMENT DESTRUCTION MEMO. MEMO. DESTRUCTION DOCUMENT WO WO LONGER EFFECTIVE T C n C C O i Q T A H COPY NO.COPY 53 §.

___ DECLASSIFIED-PUBLIC DISCLOSURE IMSM-130-96 DECLASSIFIE-MISE EN LECTURE PUBLIQUE tin' » ■ttiMnm' TOP SECRET traffic. TOP SECRET Combined Cipher Combined a further study of the problem of increasing the ofincreasing problem theofstudy afurther provideto particular in and general Inc. 18 1- Pages 171/4 S.G. 18 June 195218June .. 171/4 S.G. be possiblesbe REPORT BY THE COMMUNICATION BY REPORT modification is known asAgER isknown modification key lists of a new type.ofanew lists key prepatheentail These 2. The United States and the United Kingdom have now completed havenow Kingdom the andUnited States The United 2. 1. To enhance the security of the Combined Cipher Machine in Machine Cipher Combined theof security theenhance To 1. in a set. ain p can easily be made to both^C.Ç. to easily bemade can 3. The United States United The 3. rings.notch the 1952. rocedure for itsfor rocedure PLAN FOR THE EMPLOYMENTxOF THE CO THE THEEMPLOYMENTxOF PLAN FOR . a. An electro/mechanical^modifi An . a. imiu c Teices rmtn ftenme of rotors ofthenumber ten from increase The _c. d. The design of design The d. Proc b. . oitoueHRE o AG£%ïïtQs n1 October1 on forNATG^£p%uï5ï^tiQns HERMES introduce To a. M achine e FACTS BEARING ONTH BEARING FACTS dural changes as describedîp Spplosure asdescribedîp changes dural rfîs.. a i ntroduction a ntroduction a nd hav nd r STANDING GROUP STANDING a ■' a a nd the United Kingdom I^râêed it will it will I^râêed Kingdom the nd United a (CBCS15/6) THE PROBLEM THE t S o, p ion, * ■ *-p " ELECTRONICS COORDINATION SECTIO COORDINATION ELECTRONICS to theto 1 - 1 - e agre^cp upon: .on M a rotor xfhichrotor p will Saddtis fi n ofthe and ofit anddetails ES M r means r oductinn-.and'distributionof kI n ... iII This III. . Mi andIIC.C.M. Mk E ie tEcoue "A". eatEnclosure given ■ . a / ` v.. PROBLEM M BINEDC for the for c ation to thetomaze\fhich ation . 1FIED T E R S B G O T A N T E R C C O O T A N I , a P s H ecurity ofthe. ecurity ER ER MACHINE e ncypherment of ncypherment e rmit rmit r " B'1. otation of otation 3 S N