Historical Document · 1945
Interception, decryption and delivery times for the Japanese pilot message, the 14-part message and the "1 p.m." message of 6–7 December 1941. NSA REF ID A488471.
REF ID:A488471 Information from DocumentarY ~Tidence on Messages No, 901, 902. 907, 9!Q Note: Information based on docnunents in Navy files indicated by "(N) 11 ; information based on documents in Army files indicated by tt(A) 11 , No. 901 (pilot message; Exhibit 1, p. Washin~ton Filed by the Japanese 8:56 p,m. 6 Dec Tokyo time (A & N) Intercepted 1~ Japanese code by Navy Stat,ion S (Bainbridge Island, Washington) 1215-1220 GMT 6 Dec (N) Time 6 : 56 a. m, 6 Dec· 7:1'5-7:20 a.,m, 6 Dec 'reletyped in Japanese code to Navy (1-T & A) Teletype sheet containing Japanese code received by Army SIS from Navy (A) 12:05 p.m. 6 Dec Decoded, translated and typed at Army SIS (A) 6 Dec- No. 902 (14 part memo; Exhibit 1, pp, 239-45) Part 1 Filed by the Japanese 10:00 p;m, 6 Dec Tokyo time (N) · Intercepted in Japanese code by Navy Station S (Bainbridge Island, Washington) 1303-13l0 GMT 6 Dec (l~) 8:00 a.m. 6 Dec 8:03-8:10 a,m. 6 Dec Teletyped in Japanese coc5..e to Navy (M) Received in Japanese code in Navy Dept. 1649 GMT 6 Dec (N) 11:49 a,m. 6 Dec Decoded* and typed up at Navy (N) 6 Dec *All :parts of the· message were _in ~lish, so that translation was not required.. @'pp roved for Release by NSA on 11-06-2013 pursuantto E .0. 1352a Part 2 Washington Time Filed by the Japanet~ 10:30 p.m. 6 Dec Tokyo time (1-r) 8:30 a.m. 6 Dec Intercepted by Navy Station S 1337-1343 GMT 6 Dec (!IT) 8:37-8:43 a.m. 6 Dec Teletyped in Japanese code to !favy (N) :Received in Japanese code in Navy Dept 1649 GMT.6 Dec (N) 11:49 a.m. 6 Dee 6 Dec Decoded*and typed up at 'Navy (N) Part 3 Yiled by the Japanese 10:40 p.m. 8:40 a.m. 6 Dec 6 Dec Tokyo time (N) Intercepted in Japanese code by Navy . Station S 1349-1358 GMT G·Dec (N) 8:49-8: 58 a.m • 6 Dec Teletyped in Japanese code to 1Tavy {N) I Received in J'apanese code in Navy Dept. 1__649 GMT 6 Dee {~) ( 11:49 a.m. 6 Dec Decoded and typed up at Navy (N) 6 Dec Part 4 Filed by the Japanese 11:55 p.m. 6 Dec Tokyo time (N) 9:55 a..m. 6 Dec Intercepted .in Japanese cod~ by Na"VJ" 10:0~10:20 Station S 1505-1520 GMT 6 Dec (N) a.m. 6 Dec Teletyped in Japanese code to Navy (N). Received in Japanese code in Navy Dept._ 1649 GMT 6 Dec .(N) Decoded and typed up at Navy (N) \ 11:49 a.m. 6 Dec 6 Dee •Actually the decode wa~ on t~e basi~_of a teletype troft N~vy St~tion M (Chol tenhM• Mnryl."'J':ld) i · :i.pparentiy ·received before teletype from Station S was received. c Part 5 Washington Time Fiied by the Ja~anese 11:59 p.m. 6 Dec Tokyo time (N) 9:59 a.m. 6 Dee Intercepted in Japanese code by Navy Station S, .1540-1546 GMT 6 Dec OT) 1oi4~10~46 a.m. 6 Dec Teletyped in J~panese code to Navy (W). Received in Japanese code in Navy Dept. l'.:l5l GMT 6 Dec (?ir) 2: 51 p.m. 6 Dec Decoded and typed up at.Navy (M) 6 Dec Part 6 Filed by the Japanese 12:30 a.m. 'f :Jee Tckyo time (lJ) 10:30 a.m. 6 Dee Intercented in Japan~se code by Navy . Station S, 161_8-1624 GMT 6 Dec (iT) 11:1a.:.1i': 24 ·a~m. 6 Dec· .•..:. Teletyped in Japanese code to Navy Or) - ' .Received in Japanese code in Navy Dept. 1951 GMT 6 Dec (N) . 2:51 p.m. 6 Dec Decoded and typed up at Uavy (M) .. Part 7 .. - Filed by the Jap!lllese 1:07 a.m. 7 Dec Tokyo time {N) 11:07 a.m. 6 Dec Intercepted in Japanese code by Navy Station S, 1605-1618 GMT 6 Dec Or) 1.l:OS.-il:l8 a.m. 6 Dec Teletyped in Japan~se ·code to Jfavy (l:r). Received in JapAAese code in Navy Dept~ 1951 GMT 6 Dec (N) 2:51 p.m. 6 Dec .·. Decoded and typed up at Navy (N) Filed by the Japanese 1 :07 a •.m. 7 Dec Tokyo time (N) 11 :07 a. m. 6 Dec Intercepted in Japanese code by Navy ll:40-llt68 n.n. Station S, 1640-1658 GMT 6 Dec (W) ' - ... 6 :Oec .- " · . . . " . ' '. ~ ' Part 8 (Cont'd) ~ Washington Time Teleptyped in J~panese code t~ Navy (N) Received in Jr1.panese code' in N?.vy Dept. 1951 GMT 6 Dee (N) 2:51 p.m. 6 Dec Decoded and typed up at Havy OT) 6 Dec Part 9 Filed by Japanese 11:55 p.m. 6 Dec Tokyo time (1:r) 9:55 a.m. 6 Dec Intercepted in JapPnese code by N~vy Station S, 1530-1536 GMT 6 Dec 10:30-10:36 a.m. 6 Dec Teletyped in J'apMese code to Navy {1r) Decoded by Army SIS (N) Typed at Navy (Nl 6 Dec Part lQ Filed b~ Japruiese ll:ES p.m. 6 Dec Tokyo time {N) 9:59 a.m., 6 Dec Intercepted in Japanese code by Navy Station S, 1517-1525 GMT 6 Dec (~) 1-0:17-10: 25 6 Dec Teletyped in Japi:o,nese code to Navy (N) Decoded by Army SIS (N) 6 Dec Typed at Navy {N) Part 11 Filed by the J'Rpanese 12:31 a.m. 7 Dec Tokyo time (N) 10:31 a.zn. 6 Dec Intercepted in Ja.pruiese code by Nrwy 11:07-11:16 a.m. 6 Dec Station S, 1607-1616 GMT 6 Dec (N) Teletyped in Jnpanese code to Navy (N). Received in Japanese code by Navy Dept. 19.51 GMT 6 Dec (N) 2:51 p.m. 6 Dec 6 Dec Decoded i:o.nd ~typed by Navy (N) ) -4- PFtrt 12 Washington Time Filed by the JanPtnese 12-:49 a.m. ? Dec Tokyo time (IT) 10:49 1'1...m. 6 Dec Intercepted in JFtpanesc code by NF1.vy St~tion S, 1600-1608 GMT 6 Dec (F) 11:00-11:08 A.,m. 6 Dec Teletyped in Japt=l.nes'e code to Navy (N) Received in JFtpA.hese code by Navy Dept. 1951 GMT 6 Dec (N) 2: 5l p. m. 6 Dec Decoded and typed by Navy (N) Part 13 6 Dec ... Filed by the Japanese 1: 25 a.m •. 7 Dec Tokyo time (!T) 11:25 a..m. 6 Dec Intercepted .in J'apMese code by 1TA.vy Station S, 1635-1652 GMT 6 Dec (N) 11:35-11:52 l'l.,m. / 6 Dec Teletyped in Japanese code to NFtvy (N). Received in JapM.ese code by Navy Dept. 1951 GMT 6 Dec (W) 2:51 p~m. 6 Dec 6 Dec Decoded and typed. by Navy (N) Part 14 , 2:38 a,.m. 7 Dec Filed by the Japanese 4:38 p.m. · 7 Dec Tokyo time (N) Intercepted in Japanese code by Navy Station S, 0805-0810 GMT 7 Dec (N) 3:05-::-3:10 a,m. 7 Dec T'eletyped in Japanese code to 1Tavy o~r) 7 Dec Decoded and typed by Navy (N) No. 907 (one o•clock message~ p. 248 Exhibit 11 Filed by the Japanese 6:18 p.m. ? Dec Tokyo time. (N) 4:18 a..m, 7 Dec Intercepted in Japanese code by i!TF.vy Station S (:Bainbridge Island, 1'/'p"shington) 0937 GMT' 7 Dec (1-T) 4:37 a.m. 7 Dec 5- REF ID:A488471 c no, 907 (one o i clock mess."l.ge; p, ?.48 Exhibit 1) (Cont'd) WA.shington Time Teletyped in Japnnese code to lfav~r (A) Decoded by Navy (A) Sent by 1'Tiwy to ArMy SIS Trr>.nslated ~nd typed by Army SIS o~ b~sis of Navy decode (A) 7 Dee l:T9, 910 (code destruction; p, 249 Exhibit l) Filed by the Japanese 6:44 p.~. 7 Dec Tokyo time (N & A) 4:44 a..m. 7 Dec Intercepted in Jap~nese code by Navy Station S (Bainbridge Isl~nd, 1fashington) 1007 GH!r 7 Dec (1T) 5:07 a.rn. 7 Dec Teletyped in J~p~nese code to Navy (A) Decoded by Navy (A) Sent by Mavy, to Army SIS Translated and typed by Army SIS on basis of Navy decode (A) 7 Dec