.. 

USCIB: 29 .11/13 

1 February 1955 

EO 3.3(h)(2) 

PL 86-36/50 USC 3605 

MEMORANDUM FOR THE Ml!MBERS OF USCIB: 

Subject: I Prospectuses of Crypta;narytic T/ainiJ::lg ~ Reference: USCIB 29.11/12, dated 3 January 1955. 

1. In connection with the reference, NSA member of USCIBEC has 

prepared the enclosed prospectuses of cryptanalytic training courses, 

which are forwarded for vote sheet approval with a view to sending the 

approved version to LSIB. 

2. In anticipation of a possible future requirement for a similar 

prospectus along T/A lines, the Director, NSA states, in his covering 

memorandmn (enclosed), his willingness to prepare such a document if 

the members of USCIB so desire. It is requested that vote sheet replies, 

which should be returned by 11 February 1955, indicate also your desires 

in this regard. 

3. It is requested that the kr!m:y member comment upon the releasability of D/A TM 32-220 mentioned in the enclosed memorandum by the NSA 

member of USCIBEC. 

Enclosure 

NSA Serial 546 dtd 24 Jan 1955. 

USCIB: 29.11/1.3 

COi'VFIDEJ\rTIAL 

Declassified and approved for release by NSA on 04-23-2014 pursuant to E. 0. 1352B 

24 
60NFIBRff I:Af. 

NATIONAL SECURITY AGENCY 

WASHINGTON 25, D. C. 

MEMORANDUM. FOR THE EXECUTIVE SECRETARY, USCIB 

Serial: 546 

25 JAN 1955 

SUBJECT: Prospectuses of Cryptana~ic Training 

Reference: USCIB 29.11/12, 3 Jan 55 

1. The prospectuses mentioned in the reference have been 

completed and 40 copies of each are inclosed for distribution to 

the members of USCIB. 

2. In order that a complete list of releasable training 

materials may- be compiled and held in reserve to meet possible 

future requirements, the Director stands ready to prepare a. 

similar prospectus for T/A training materials, should the Board 

so desire. Also, it is suggested that the Assistant Chief of 

Starr, G-2, D/A, be asked to comment on the releasability of DA 

TM 32-220, "Basic Cryptography, 11 which could be used to provide 

some of the prerequisite information cited in connection with 

Inclosures 2 and 3. 

3 Incle: 

{SIGNED) 

D. M. AGNF.W 

Captain, US Navy 

NSA Member, USCIBEC 

l. Prospectus of Course in Military 

Cryptanalytics, Part I 

2. Prospectus of Elementary Course 

in Code Solution 

3. Prospectus of the 11GRAY11 Problem 

Enclosure with USCIB 29.11/13 dtd l Feb 1955. 
GefWit>El<ffI AL 

:Modified Handling Authorized 

PROSPECTUS OF 

COURSE IN MILITARY CRYPTANALITICS, PART I 

Materials Furnished: 

Scope of Course, 

indicating hours 

of study and 

practical 

application: 

(1) NSA Text "Military Cryptanalytics, Part I" 

by William F. Friedman'and Lambros D. 

Callimahos (December 1952). CONFIDENTIAL/ 

MODIFIED. 

(2) NSA Problem Book "Course, Military Cryptanalyt:I cs, Part I" (May 1954). CONFIDENTIAL/ 

MODIFIED. 

Lesson 1. -Basic cryptologic definitions. Generalities of fundamental cryptanalytic operations. 

The frequency distribution and its uses. The 

monographic m (phi) test for determining monoalphabeticity. Collation of garbled intercepts. 

••• 16 hours of study and'practical application. 

Lesson 2. Cryptography and cryptanalysis of 

uniliteral (simple) substitution ciphers with 

standard and mixed cipher alphabets. Keyword 

recovery from mixed cipher alphabets ••• 20 hours 

of study and practical application. 

Lesson J. Cryptography and cryptanalysis of 

simple multiliteral ciphers. Baconian and 

Trithemian systems. Elementary Baudot systems. 

••• 24 hours of study and practical application. 

Lesson 4. Cryptography and cryptanalysis of 

multiliteral ciphers involVl.Ilg variants. Analysis 

involving the use of isologs ••• 28 hours of study 

and practical application. 

Lesson 5. Cryptography and cryptanalysis of 

four-square and two-square digraphic systems. 

The digraphic m (phi) test ••• 32 hours of study 

and practical application. 

Lesson 6. Cryptography and cryptanalysis of 

Playfair ciphers ••• 24 hours of study and practical application. 

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OOPWIDEH'HAL 

Modified Handling Authorized 

Lesson 7. Cryptography and cryptanalysis of 

polygraphic systems involving large tables. 

••• 32 hours of study and practical application. 

Lesson 8. Cryptography and cryptanalysis of 

monome-dinome systems and other systems with 

irregular-length cipher units. Analysis 

involving the use of isologs ••• 60 hours of 

study and practical application. 

Lesson 9. Cryptography and cryptanalysis of 

syllabary squares and code charts. Coordinate 

recovery; square recovery. Use of bulk messages • 

••• 40 hours of study and practical application. 

Lesson 10. Cryptography and cryptanalysis of 

miscellaneous monoalphabetic substitution systems. 

Concealment systems ••• 32 hours of study and 

practical application. 

TOTAL -- 308 hours of study and practical application. 

2 

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Modified Handling Authorized 

PROSPECTUS OF 

COURSE IH MILITARY CRYPTANALYTICS, PART I 

Materials Furnished: (1) NSA Text "Hilitary Cryptanalytics, Part I" 

by William F. Friedman and Lambros D. 

Callimahos (December 1952). cx:>NFIDENTIAL/ 

MODIFIED. 

Scope of Course, 

indicating hours 

ot study and 

practical 

application: 

(2) NSA Problem Book "Course, Military Cryptanalytics, Part 1'1 (May 1954) • OONFIDENTIAL/ 

MODIFIED. 

Lesson l. Basic cryptologic definitions. Generalities of f'undamental cryptanalytic operations. 

The frequency distribution and its uses. The 

monographic m (phi) test for determining monoalphabeticity. Collation of garbled intercepts. 

••• 16 hours or study and·practical application. 

Lesson 2. Cryptography and cryptanalysis or 

uniliteral (simple) substitution ciphers with 

standard and mixed cipher alphabets. Keyword 

recovery from mixed cipher alphabets ••• 20 hours 

of study and practical application. 

Lesson l• Cryptography and cryptanalysis ot s~le multiliteral ciphers. Baconian and 

Trithemian systems. Elementary Baudot systems. 

••• 24 hours of sturty and practical application. 

Lesson 4. Cryptography and cryptanalysis of 

multiliteral ciphers involving variants. Analysis 

involving the use or isologs ••• 28 hours or study 

and practical application. 

Le,sson 5. Cryptography and cryptanalysis ot 

four-square and two-square digraphic systems. 

The digraphic m (phi) test ••• 32 hours or study 

and practical application. 

Lesson 6. Cryptography and cryptanalysis ot 

Playrair ciphers ••• 24 hours or study and practical application. 

CON FIDENTil~L 
90NPIBBN'fi:Afi 

Modified. Handling Authorized 

Material Furnished: 

Assumed Knowledge: 

Scope of Course, 

indicating houra 

ot practical 

application: 

PROSPECTUS OF 

ELEMENTARY COURSE IN CODE SOLUTION 

"An Elementary Course in Code Solution." National 

Security Agency (November 1954). CONFIDENTIAL/ 

MODIFIED. 

No text acconpanies this course. A prior familiarity with the cr;yptograptcy: of one-part codes and 

additive encipherment of numerical codes, with the 

frequently occurring Morse garbles, and with the 

use or a permutation table for the purpose of 

degarbling errors is assumed. 

The course consists of three problems to be solved. 

The scope of each and the time required for 

solution are as follows: 

The AKOMPANI Problem. Initial entry into an 

unknown one-part code book through the recovel"Y' 

of encoded addresses and signatures; further 

reconstruction of the code book, capitalizing 

on its one-part feature and on the stereotyped 

passages in the mPssage texts ••• 24 hours of 

prAbtical application. 

The NABUCO Problem,, Degarbling reception errors 

and clerical errors from the code tms, and 

recovering the meanings of several new groups. 

• • • 12 hours of pract.ica.l application. 

The NIVELLE Problem. Assuming plain text in 

additive-enciphered code messages which involve 

tor the most part code groups whose meanings have 

previously been recovered, and thereby recovering the additive key lmd. the meanings ot some new 

groups • • • e hours ot practical application. 

TOTAL -- 44 hours of practical application. 

CONFIDENTIAL 
COHFIEJE!ffildi 

Modified Handling Authorized 

PROSPECTUS OF 

THE "GRAY" PROBLEM: 

Materials Furnished: (1) "The GRAY Problem." National Security 

Agency (l May 1953). OONFIDENTIAL/ 

MODIFIED. 

Assumed Knowledge: 

Scope ot Problem, 

indicating hours 

ot practical 

application: 

(2) "Training Code No. 2 (GRAY)". National 

Security Agency (April 194B). UHCLASSIFIED. 

(.3) "Difference Tables for Training Code No. 2.n 

National Security Agency (January- 1948). 

UNOLASSIFIED. 

No text acconpaniee this problem. A prior familiarity with the cryptography of' additive encipherment of numerical codes and with the cryptanalytic 

technique of differencing code groups is assumed. 

The GRAY Problem is a. problem. in the cryptanalysis 

of an additive-enciphered code system involving a 

known code book. Essentially the problem requires 

recovering the plain text.a of the messages and 

reconstructing the additive page with its coordinates. 

••• 24 hours of practical application. 

CONFIDENTl2\L