Mr. William G. lieyan 

Box 267, Geauga_ Co. 

Burton,. Ohio 

Dear Mr. Bryan: 

I REF ID:A4148469~ 

4 June 1948 

Reoeipt of your letter of 24 Jlq 1948 io acknowledged. First 

let me tht.Ulk you tor yotir prompt. return of the card containing data 

for our files pertaining to .tor.mer emplo79ea. We hope to keep theae 

!ilea up-to-date 10 that in oase of emergency we can readily contact 

our for mer co-work ere. 

In connection with the problem which ia given :tn Gioppi•s book 

and which it i• al.leged has not been decipher9d hitherto,. you may 6end 

the solution to me, if you wish to do so> tor examination and recoantnda.tion aa to whether it• publication in your journal would be detrimental 

t.o eeC\ll"ity. At the 100ment l !ind it hard to think that the publication 

ot valid aolution to such an old oryptogram would present an.y .iseourity 

problem. · 

A8 to your correspondence witb Dr. Langer, I can see no good reaeon why 70u should hesitate to send him your publications and receive . in r1tturn docwn.ent& which .might be of intere1t. However, in this oaae 

I would · like to see what Dr. Langer furniehes bet ore you make any use 

ot this material, f'or it may well be that from a viewpoint of the 

national interest eome of hie material should not be published in your 

journal, which haa a wide distribution. 

In closing,, permit me t.o thank you very much tor your thoughtf'uln••• and yt>u.r interest in·rui.tional security in coneulting me in regard 

to the '-:.ueetions you raise in your letter. I appreciate the opportunity 

to be oonltUlted in auah matters before pos8ible damage hne1 been done .. 

The cooperative spirit and interest o! your membership in maintaining 

aecur1.t7 is moat commendable. · 

Reciprocating your kind personal :-egards I I am, 

Sincerely you.rs, 

H1\BGLD G. HAYES 

Colonel, Signal Corpe . Chi et 1 Army Securi tT Aguncy 

@'pproved for Release by NSA on 11-04-2014 pursuantto E.O. 1352a 
e ·•I'. Textbooks 

Elementary Cryptanalysis • REF IR:A4148469 • Solving 

Simple Substitution Ciphers 

HEADQUARTERS 

Harold G. Hayes Colonel, Signal Corpe 

Chief, Army Security Agency 

The Pentagon, Washington 25, n.u. 

Dear Col. Hayes: 

BURTON, OHIO 

May 24, 1948 

Please Reply to: 

Burton, Ohio 

It is gratifying to return the enclosed card for your f1les, and 

to realize that the agency still in intere~ted enough in my 

current address. 

And I am also happy in learning of your own address, so that when 

matters of a "doubtful" nature arise within our organization, I 

can feel that you are the one person with whom such matters may be d1ecuaeed. 

At present there are two such matters, and I would appreciate 

your comment, at your convenience. 

The first deals with a mPmber,or our Association, who "claims" to 

have solved the hitherto undecipherable problem which appears in 

Luigi G1oppi 1 s La Cr1ttografia, Hoepli, Milano, 1897, as given 

1n Chapter V, Modern Indecipherable Methods~ far, I have withheld all publ1c1ty on this matter, preferr1 o check with your 

agency as to whether or not it might be perm tted. 

The second deals w1th correspondence of a questionable nature with 

Dr. Phil. Albert Langer, Velden am Worthersee, Villa Weiss, Carinthia, Austria, Europe, who, having learned of us through the Library of Congress, is eager to have our publications; and in return, since 

it ia difficult to send money out of Austria, is willing to send 

us some of h1e writings dealing with "What ehould the censor1ng- offic1al know about secret information"; "Machine cod1ng"; "Construction of Counter Machines", etc. He cla1Ill! to have worked 30 

years in this sphere of .act1on,and considers himself an expert in 

the mathematical treatment of the matter. He says his methods go 

far beyond Givierge and Baudoin. 

Up .to now, negotiations with him have' been checkmated; pending a 

clearance throu~h your office. Much of h1s material ie way over 

our heade, since we are merely an amateur orgRnization; but 1t 

we are able to obtain any of hie information, we question its 

value in other fields. 

W1 th best personal re~~Ijd,s 1 / ~i Y< ,,,, A~ Sincerely~au..u _A./~.,,.,-- r 

William u-. B .yan / ~ - ___.. _J -