Dear Captain Pilb7: 

.Arlington Ball Station 

25 April 1944 

I was very pleased to receive 7our letter ot the 6th 

ot April together vith the tvo inclosurea. I deepl7 appre- ciate :Ir. Stl'&ch97'a courtea7 1n -.Jctng these two papers &vail&ble and I am on17 sorr7 that 7ou did. not get them 

autographed tor •. At the risk ot •king a nuisance ot 

97aelt, I aa going to ask an additional tavor 1n this connec .. ·· 

tion. It 7ou could obtain another set of these same tvo 

papers, and b&ff Mr. ltrache7 autogl'&ph them I vould deposit the onea which 7ou have already sent me in our 11br&J7' at 

the ott1ce, keeping the autographed ones (it they should be 

torthcOJ11ng) tor mJ'Selt. Do 7ou think that it is at all ~~·~~le? • ' ;._ ' C" .... :~ .; ' • ~ -

, ·:.~ .l&at t~. pages or Str&che7•a "Note on Short Period 

Subat1tutiona Used on Code Books" are extremel7 interesting 

tram a historical v1evpo1Jlt. It 7ou would ahov these two 

pages to Colonel Tiltman be would no doubt receive quite a 

thrill. Oliver vas a ll&ll ot considerable perapicu1t7 vben 

be VPote those tvo pages. 

One d&7 last week vhen I vaa· cmi1'Dg b&ck: trom Bev York ~ta~ l~cp,;~ :~•"dining 9a.r, l. noted a 7oung wc-.n 

vboae t~•" ~: :r•l:~. ~ ... 1t,r,v&s ~-a tev mnutea t,here-. 

atter that I re&'l!.zed that it J11UBt the "Y" Denniston.· She 

v.aa ciseated .amnna a group ot Jlarine voaen recruits in c1v111&n ~-0 1' • 1.1- cmess, so I.""*• .a pi~-. ~d ~~;al~ ~ ~o~, ~--j·\_i RV' 

b&d & nice r~ :fl~,_ ~ t9}\U~ ,~.., a1tt.~ ..; c<lQle::,·,ot 

••ta f':roii ae in t~• parlor car. \re &re having the young a.a~ 1D ~r .~~ ~μJ-••7 .night and hope to take part in 

l~~.,at~~- hul .. ~l•.Ji~ ·i¥ he~ Al..~ M-4• &nJ:. ·~•tion. 

Sh• •e• .to ~~ -~~' " _A~4t' ~ot. • >too_ld.M ../ ·ou~ t.O'JJ· P• • Jt•~~•lt. r 

Yo~ nna. ab~ht. -.1&i'rlc'a ~·tleT i~ fq~ te -diatreaii:ini~: f . 

. ~ a l~~ tro~ ~J' ~-~.~_qt ~~ha .~ ~ indicated 

tba.t :~lie,,.... ~~~D_g-tQ,{..~ .. ~c~ ~,Berk•l•i s~ .. t ~~pril or 11&,.,. but t~~ ~:ppears ~~· q~ . .ou( of-~ qu~a1'i~ ~J.S,b..t ,Ao•··. 

Wb&tever 'c&:D ~~:th• ... •~~~... _ , _ _ _, , . , : . . . : · 

-, Wf:l ~-:• -.V.e::I:'J' nice conterence here, the Cba1ransb1p ot, • ... 

~-ob. 4 ~ I )i&d '.~e _boAor ~ ~ _AA -~~lee_;~ .... .. , l .. ,~~~ ~ ~erence 

, •• 1 ~ 

Declassified and approved for release by NSA on 03-24-2014 pursuant to E.O. 

13526 
REF ID:A70075 

&J tb.1,.,. tia•. no.~~.J'OU v111 have bad a visit or tvo ,t~o.a. C&ptatn .f,~e4:- . 1'• &p)ea~•. ,_o ~· JIOBt •nt~vJ•.'9.~ic __ 'bo11t 

his a.a~!~n~ :&n4 J; b~" 1~ 1'.111. -.11 t~cl ~ &n· ~l~"'- . - courte~. a,nd :t"~ q_o~t_iv• P_~_preaenta~i1f•· . .. >: ,. 

'Under~oun<f ~bamieii ·t~ll me that there. is a !potlsibility 

that ~. D~1;~ 1//.IJ9· ~. ~o~ng_. oy4t_r· b~r.e l•~•r on.~ ·I 

••17 auell hope ~t. tb1a< lt!~. be,:~ tor 1t voUld b_e lli~-,~.o 

·Jj&..,. another 113,J.it .from. ~.. . . . . . . . , 

. :· Don't .WOl'"l'J' . too --~ •bout . t:f..71li& . tO, -~·~ a eo •. ot ... -Loopy L1mer1cka"; it l'r no_t 1mpora.:t- enough to put_ &JQ"bQcl7 ~o &llJ" trou.l:>l•. · ·: ,. · · 

. . . '!'bank JOU tor 70'1Jt Yf#rT. good lt~aheli. Ill's. Jl'J-iedman joins 

ae. 1A ··~~- 001';41.&l. gree,inga to J'C)u.. . · 

i, - . . 

capta..in P. .w. · Pilb7 Be!'~l.9,- ·street -Lo~. , , ~ !' - " 

Sincerely 7oura 1 

r_ ,. _ .. Jr. • 

• 
REF ID:A70075 

I 

Dear Mr. Friedine.n, 

Berkeley Street, 

London, w.1. 

6th April, 1;944. 

Very many thanks for your letter of 28th 

February, 1944. 

I hope your conference was successful and 

that .Mrs. Friedman was not unduly tired by the numerous engagements which inevitably occur from visits 

of your British friends. Certainly, if Mrs. 

Friedman looked after your visitors as perfectly as 

on 'the occasion of my visit she must have been tired. 

. As for Barbara and Girton! Girton and 

Cambridge will still exist after the war ~nd I expect 

I too shall return, so that my offer will always stand. Perhaps Commander Denniston's daughter will 

influence Barbara! 

Patricia is far from well. She went up to 

oxford to aomplete her degree, but alas, she had to 

return home and is now living the life of a semi 

invalid. I understand that her fiano~ is duD to 

arrive in England in the.summer, but in any case I 

fear that her return to Berkeley Street is unlikely, 

at least for the next few months. 

As you will see I enclose Mr. Strachey's works. When I first mentioned tharn to Commander 

Denniston Mr. Strachey w~s ill and on his return he 

gladly gave permission for two copies to be sent to 

you •. ·He asked me to .sayl that th~y .were now quite out' of date and that you would of eour.se realise . ! 

I 
e REF ID:A70075 

- 2 -

this. An¥Way, I am sure you will welcome them as an 

addition to your very fine cryptographic library. 

:Magniac's "Loopy Limericks" presents a 

problem. I called on the publishers but as you know 

the whole of Paternoster-Row was destroyed in 1940 

and with it Jarrold's stock of publications. However, I have asked them to note your request and 

have told my friends to watch out for it and I have 

every hope of success. 

My best wishes to Mrs. Friedman.· 

' 

Sincerely, 

' 
• REF ID:A70075 • 

SPSIS-3 

28 February 1944 

Dear Captain Filby: 

I have two of 7our letters nov. one of December 29 

and the other or January 26. The latter having arrived just the other day. 

Both Mra. Friedmn and I are very glad that 7ou h&d 

such a happy time vbile in 'Washington ~d that ve bad a 

a•ll part in •ldng it so. We are pleased to learn that 

our book-plate 1a nov embalmed properl7 1n the Cambridge 

Un1Yersit7 Libra~. We have not 7et dared to bring up the 

subject or Girton so f'a:r as Barbara 1a concerned because 

of the enthusiastic responses which vould no doubt ensue 

to be followed thereafter b7 a mild sch1zo~n1e dichotOID.J' 

induced by her being torn between tvo desires. She la that 

sort ot child. 

I have a baz7 idea that CnmM.nder Denniston did give 

UJ5 a COP7 ot the form Which is eigned b7 ;rour people but 

I am arn.Ad I would have d1ftieult7 in loeattng it. However. 

;rou may forget about it aa vell as a copy of "Dora•. It is 

good ot 7ou to keep looking tor the items Yhich 7ou tho-sht 

;rou might be able to f'ind f'or me. I am. of co~ae. eapec1&ll7 at,l'eate4.in tJ•tt1.ng a copy of Mr. Stratche7'• vork and 

hope_'fou will JC••P&f'ter- it. I can add one f'urtber item 

that 7ou might be able to find 1n some book-shop. One of' 

our lads bought a copy in Brisbane and tells me tb&t vaa 

the only one available. I will attach the title and publisher 

to this letter. 

We are looking rorvard with a great deal ot pleasure 

to seeing Commander Travis. Colon~l. T1l~~ ~·others 

vho are coming to our co.nt'erenee wh1ch will"Ol*il vith1.ll a 

t•v. ~7s. We hope to get through a good dell of' 1mport&llt w0rk tor the tuture.. ., . _ . '~'- ..': . . . ' } \ '• ' 

, /' f"'pad a very ni~• 1•~ter from Patricia. the oth6r.4&t' ;-~ and 1a. going to &naver it the fll"st mo!llent I get a eb&nee. 

l,aa ffrJ.baPPY to learn that she is better and hope that 

•, 
REF ID:A70075 

she will be vell enough to join your group in April as she ant1c1:~te~. 

· Ple&~e give 117 verr best greeti.ligs to ever1bod.J' at · 

Berkeley Street &nd · especi&lly to ComrM.nder Denniston. -'Tell 

Thornet I will write to him soon to thank him tor his note 

ot app~eciat1on. 

. ., 

'· 

Captain- P. w·. Fllby 

Bei-kele7 Stx-~et, ,. . ._' . . 

• • 

,. 

., 

... 

. . , 

-· 
• REF ID.:AJ0075 

• . . 

she will be well enoug~ to. join your.group in April as she anticipate~-.·· : •, . 

Please give my very' ·bes.t gr~eti.ngs. tq everybody. at 

Berkeley ~treet and especially·to Comma.nd~r Denniston. Tell 

Thornet I will w~ite to him· soon to thank him for his note of apprec~~ tion~ · 

Captain P·. W. Filby Berkeley Street . 

... 
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