. . 

NSA REGUIATION 

NATIONAL SECURITY AGENCY 

Washington 25 1 D. C. 

NUMBER 90-2 (Change l) 

s;?ssT 

/tif pP/EQA;,,;11) 

16 May 1955 

CANCELIED WHEN CHANGE IS ENTERED IN BABIC REGULATION 

NOMENCIATURE FOR COMMUNICATIONS SECURITY MATERIAIB 

In NSA Regul.ation Number 90-2, dated 24 November 1954, make 

the following changes: 

a. Remove pages 3 and 4 and insert the revised pages 3 and 

4 attached hereto. Tb.is revision incorporates: 

(1) Deletion of the old sub-paragraph 3 c and redesignation and correction of sub-paragraph 3 d 

under Section III. 

(2) Changes in the context or paragraph 4, Section III, 

entitled "Development Model Idcmti:f"ication." 

(3) Renumbering of "Modification Identif'ication paragraph under Section III. 

b. Remove the Append iX and insert the revised Appendix 

attached hereto. This revision incorporates: 

(1) Addition of a. new category, "L - Miscellaneous" 

in Col.umn 4, under "COMSEC A.JDS." 

(2) Changes under "Examples," making them can:patible 

with the revisions indicated in a (1) and (2), 

above. 

Declassified and approved for release by NSA on 11-15-2013 pursuant to E .0. 1352a 

€()NFIDENTIAL 
BSA mxm.ATION RO. 90-2 (Change 1) 16 May 1955 

c. ny pen and ink correction in Section III, paragraph 5 a (1), delete the numeral "2" appearing at the em of the ahor\ 

title ''KLB-3C/TSF£. " 

d. Change Section VIII to read: 

"Statt supervision o'f the policy eatabliahed herein 1• 

t.he responsibility ot the Deputy Director, Canmun1cat1ona Securit7." 

OFFICIAL: 

GEO. E. ELL 

Colonel, AGC 

Adjutant General 

Incls: 

JOHR B ACICERMAB 

Ma.Jor General, US Air Force 

Chiet ot Statt 

Pages 3 & Ji., and Append1x 

(Revised) to BSA. Regulation 

90-2 dtd 24 Kovember 1954 

DISTRIBUTION II plus c~ 25 

CIA 

State Dept. FBI 

- 2 - €0NFIDENTIAL 

~ . 
COlfii'IBl!lN'ffA:D 

NSA REGUIATION NO. 90- 2 24 Movember 1954 

(b) Short titles for €0MSEC aids will be derived as 

explained in SECTION IV. 

d. "TSEC' nomenclature will not be assigned to parts, subassemblles, sub-units or similar items that will othervise be subject 

to parts cataloging under other systems~ 

SECTION III - SHORT TITLES FOR COMSEC EQUIPMENT 

l. Definitions: For the purpose of assignment of short titles to 

equipments and components, the following definitions will apply: 

a. Equipment: A singre equipment, or a group of two 

(2) or more components which is capable of operating independently 

to perform all the functions required to fulfill an intended COMSEC 

purpose. (Examples: literal cipher machine, teletypewriter security 

'"'tnlpment, key tape production equipment, tape checker.) 

b. Component: 

(1) A group of parts assembled together as a unit to 

perform a definite and complete function necessary 

to the operation of the equipment of which it is 

a part. (Examples: cipher unit, key generator, 

alarm unit, stepping unit}, or 

(2) A group of parts assembled together as a separately 

removable and replaceable (epd accountable, as appropriate) unit, although the group may not, in itself, 

perform a complete function necessary to the operation 

of the equipment of which it is a part. 

(Examples: drawer, cabinet, keyer assembly, tube 

chassis.) 

2. Equipment Short Titles: Equipment short titles will 

contain the following elements, arranged in the order listed: 

a. The system designator "TSEC", followed by a slant line. 

b. A type number consisting or a descriptive digraph, a 

dash and an equipment number. 

(l) Descriptive digraphs will be selected from the Table 

or Indicators: each will include: 

(a) A "Function'' indicator, to indicate the basic, 

or general function which the equipment performs. 

- 3 -
BSA RBGULATIOB BO. 90-2 24 November 195~ 

t• 

(b) A "Type" indicator, to indicate the general 

type ot the equipnent. 

(2) Equipment numbers will be selected conaecutivel7 

beginning With 1 tor the first of each aeries of 

identical descriptive digraphs. 

c. Examples: 'I.'SEC/IGl-1, TSEC/HY-3, TSm/MP-7. 

3. Component Short Titles: Component short titles will contain 

-Pollowing elements, arranged in the order listed: 

a. A type 1''1.:.'••~"!r consisting of a descriptive trigrapb, a 

Claah and a canponent nwnber. 

(1) Descriptive trigraphs will be selected trcn the 

'!'able of Indicators; each will include: 

(a) The "Function" and i'Type" indicators ot the 

equipment ot which the component is a part;. 

(b) A "Component" indicator, to indicate the 

specific t1119 or :function of the ccmponent. 

(2) Component m.mibers will be selected consecutivel.7 

lieginning with 1 tor the first ot each aeries ot 

identical trigraphs. 

b. i\le system designator "TSEC" preceded by a slant line. 

c. Examples: nc-3/rrsre, mm-3/'l'SEC, llB-7/rmm. 

4. Development )bd.el Identification: 

The letter "D" and a number inclosed in parentheses following the basic short title will identify an equipment or canponent 

that is 1n research or development. Beginning with l for the first 

model., succeeding models will bear consecutive numbers. When the 

f'ilJal model goes into production, this element ot the short title 

will be dropped. 

Examples: TSEC/I0.-4(D-l), KY0.-3(D-5)/TSEC 

5. l&:>dif'ication Identification: 

a. Each s1gn1f'1cant modification to an equipment or can· 

ponent that results in the loss ot interchangeability of' its 

.. 4 - (Revised l>ia.y 1955) 

eONFIDENTIA1"' 
... 

J 

NOMENCLA'l\JRE SYSTEM FOR u.s. COMSEC MATERIALS 

( "TSEC" SYSTEM) 

TABLE OF INDICATORS 

Eq]IFMl!:RT INDICA'JX>RS OOMPONENT llIDICAiORS 

FUNCTION TYPE 

K - Ceyptographic A - OOMSEC aid 

H - Ancilla:cy' 

G - Key generation 

I - Data transmission ( CitroJ.) 

L - Literal conversion (Cipher) 

M - Manufacturing O - Multi-purpose 

P - Materials production 

S - Special purpose S - Special purpose 

T - 1'esting1 checking 

U - Television (Ci vision) 

W - 'l'elet.ypewri ter (Cipher) 

X - Facsimile ( C:l.fax) 

y - Speech (Ciphm.y) 

Ex!m!PJ,es: 

'l'SEC/KY-1 - Speech security eqμipnent, No. l 

TSEC/BW-3 - Teletype ancilla:cy' equipnent, No. 3 

TSEC/MT-5 - Production testing equipnent, No. 5 

TSEC/KL-bA - First :modification of literal cipher machine, No. 4 

TSEC/KX-2(D-l) - Facsimile security equipnent, No. 21 first in 

KYC-4/TSEC 

devel.opnent model 

- Combining unit, No. 4 (Kr series), for general use 

laD-7/BO 

with speech security equipnents 

- Drawer, No. 7 (KX series), pert of facsimile 

security equi:pinent, No. 2 

--3(D-2)/!SBO - Receive terminal, No. 3 (HW series) 1 for general use with tel~ ancill.a:ey equipnents, second 

in development model 

MPK-li.A/TSEC - First :modification of keying unit, No. 4 

(MP series), pert of production equipnent, Do. 3 

Appmdix to BSA. Regulaticm :ro. 90-21 24 Roveiiber ].951i. 

(lln1aed 16 - 1955) 

EQUIPMENT OOMPONEHTS OOMSEC AIDS 

A - Keying element advancing unit A - Authentication system 

B - Basic unit, base, cabinet B - Modification instructions 

c - Combining unit C - Code system 

D - Drawer, panel D - Ife;y1ng disk 

E - strip1 chassis G - General publication 

F - Frame, rack I - Recognition BM/or 

G - Key generator identification system 

H - Keyboard IC - Key list 

I - ~anslator, reader L - Miscellaneous 

K - Keying element or unit M - Maintenance manual 

L - Repeater o - Operating manual 

M - Memory or storage unit R - Rotor 

O - Observation unit s - Strip 

P - Power supply or unit p - One-time pad 

R - Receiver T - One-time tape 

S - Synchronizing unit 

T - ~ansmitter 

u - Printer 

X - Special purpose unit 

~: The table of equ1pnent 

component illdicators ms;y be 

expanded.1 as required, to 

include a complete alphabet 

for each Function or for 

each Category.