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ECM MARK 2 and CCM MARK 1

Folks,

CSP 1100(C), Operating Instructions for ECM Mark 2 (CSP 888/889) and CCM Mark 1 (CSP 1600) describes the high level United States cipher machine of WW II. More background on this machine and an Army manual may be found at:
[maritime.org]

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CONFIDENTIAL CSP 1100(C)

NAVY DEPARTMENT

OFFICE OF CHIEF OF NAVAL OPERATIONS

WASHINGTON

16 MAY 1944

ECM OPERATING INSTRUCTIONS

1. CSP 1100(C) is effective upon receipt.

2. CSP's 888, 889, and 1600 and associated publications shall not be used until the instructions contained herein have been read and thoroughly understood.

3. This publication is distributed to actual and potential holders of CSP's 888, 889, 1600 and associated publications.

4. CSP 1100(C) is a CONFIDENTIAL registered publication and shall be handled, stowed, transported and accounted for in accordance with the current edition of the Registered Publication Manual (RPS-4). This publication shall be destroyed by burning thirty (30) days after the end of its effective period. It shall not be carried in aircraft for use therein.

5. The use of this publication by enlisted members of Coding Boards, and by the authorized ECM repair personnel of ECM Repair Facilities is authorized. In such cases, the publication is to remain in the potential custody of a commissioned officer.

THIS PUBLICATION CONSISTS OF
SEVENTY-SIX (76) PAGES

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ARMY-NAVY JOINT POLICY CONCERNING DISTRIBUTION
AND DISCLOSURE OF CRYPTOGRAPHIC
DESIGN OF THE ECM-M134C

On June 26, 1942 the Army and Navy jointly agreed on the following policy:

"It is mutually agreed that the ECM-M134C will not be placed ashore in foreign territory except at such places where armed personnel of U.S. forces are stationed in sufficient numbers to properly safeguard the physical security of the machine.

"The Army or Navy may make the machine available to the Allies of the United States if the machine is accompanied by a Liaison Officer and Communication Group. It will be the duty of the Liaison Officer to prevent the viewing of the machine or its operation or associated equipment by other than authorized personnel of U.S. armed forces.

"The U.S. Army and Navy mutually agree that they will regard as secret information to be divulged only to the armed forces of the U.S. or to any U.S. citizen required to possess this information in the interests of the United States, any details concerning the ECM-M134C including rotors, wiring diagrams, keys, keying instructions and operating instructions.

"If at any time either the Army or the Navy considers it necessary to deviate in any way from this policy, the one shall fully inform the other of the facts and circumstances and the change in policy, if any, shall be by joint agreement."

STRICT COMPLIANCE WITH THIS POLICY IS DIRECTED.

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BLANK

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TABLE OF CONTENTS

PART I - GENERAL 101- Location 7 102- Type 8 Safe Locker 7 103- Army Type Field Safe CH-76 8 104- Uncrating and Crating 8 105- Shipping Damage 9 106- Inspection 9 107- Accounting 9 108- Stowage of Classified Publications 10 109- Transportation 10 110- Compromise 10 111- Destruction 11 112- Order of Destruction 11 113- Code Wheels, Destruction 11 114- Key Lists, Destruction 11 115- Machines, Destruction 12 116- Demolition Charges and Incendiary Bombs 12 117- Incendiary Bombs 13 118- Return of Superseded Code Wheels 14 119- Reports of Casualties and Defects 14 120- Stream-lined Instructions 15 121- Criticism of ECM Publications 15


PART II - DESCRIPTION

201- General 16 202- Code Wheels and Index Wheels 16 203- Cipher Unit (CSP 887) 17 204- Code Wheel Stepping Assembly 18 205- Keyboard 18 206- Printer 18 207- Zeroizer 19 208- Controller 19 209- Electric Motor 20 210- Main Shaft 20 211- Emergency Hand Drive 22 212- Automatic Word Spacer 23 213- Counter 23 214- Spark Suppressors 23 215- Input and Output Receptacles 23


PART III - OPERATION

301- Requirements 25 302- Preparation of Machine 25 303- Key List 25 304- Code Wheel Set 26 305- Code Wheel Arrangement 26 306- Index Wheel Setting 26 307- Zeroizing 27 308- 26-30 Letter Check 27 309- Code Wheel Alignment 28 310- Heading and Indicators 29 311- Encipherment 29 312- Completing the Message 29 313- Example 30 314- Check Decipherment 30 315- Decipherment 30 316- Joint Army-Navy Method of Operation of the ECM-General 31 317- Key Lists 31 318- Definitions 32 319- Encipherment 32 320- Example 33 321- Decipherment 33 322- Parallel Operation 34 323- Preparation of Machines for Parallel Operation 34 324- Operating Procedure 34 325- Emergency Operation 35 326- Correction of Errors 36 327- Garbles 37 328- Special Checking Process for "Simple-Substitution" 37 329- Random Selection of Code Wheel Alignments 38 330- Message Length 38


PART IV - MAINTENANCE

401- Routine Maintenance 39 402- Lubrication 39 403- Cleaning Contacts 42 404- Code Wheel Lubricant 43 405- Printer Ribbon Replacements 43 406- Paper Tape Replacement 44 407- Cautions 45


PART V - REPAIR

501- General 46 502- Training Schools 47 503- Qualified and Authorized Repair Personnel 48 504- Emergency Repairs 48 505- Spare Parts Box (ENG 109) 48 506- Zeroizing 50 507- Code Wheels at Stepping Maze 50 508- Code Wheels of Alphabet Maze 50 509- Keylever Failure 50 510- Motor Failure 51 511- 26-30 Letter Check 51 512- Printing 52 513- Spark Suppressors 53 514- Code Wheels 53 515- Motor Adjustment 54 516- Clutch Magnet 54 517- Rechecks Required 54 518- Adjustment Specifications 54 519- Stepping Checks 56


PART VI - CCM MARK 1

601- General 67 602- Code Wheels 67 603- Description 67 604- Stepping Control 67 605- Preparation 68 606- KeyList 68 607- Definitions 68 608- Code Wheel Arrangement 69 609- 26-30 Letter Check 69 610- Encipherment 69 611- Check Decipherment 70 612- Example 71 613- Message Length 71 614- Decipherment 71 615- Clearing Garbles 71 616- Stepping Magnet Contacts 72 617- Contact Adjustments 72 -5-


THE TYPE 8 SAFE LOCKER
and
THE ECM MK 2

PLATE 1

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