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National Security Agency, Cryptolog Vol. 2, No. 12, “Graphic Analysis of Linear Recursive Sequences,” “Great Soviet Shipbuilding Mystery,” December 1975. Secret/Top Secret.

TePlll• H WUJVVl Ululll l irnlOOW i OOlDl i UIDWV CBl W l le 0015tillDB OO W CiJflil I I PL 86-36 50 USC 3605 1 I Non - Responsive l • • • • • • • • • ••• THIS 8811JH•• 1er•·1t1a IIIBWl• a UtJ-hT 1 Declassified and Approved for Release by NSA on 04-02-2021 pursuant to E O 13526 MDR Case 109368 EO 3 3b 3 PL 86-36 50 PL 86-36 50 USC 3605 use 3605 GRAPHIC ANALYSIS OF LINEAR RECURSIVE SEQUENCES Oecellt er 75 CRYPTOLOG • Page 6 f a• a•• •••• ••ai 111111• ••-•••a a n --··· 1 ••• J --·· -- EO 3 3b 3 PL 86-36 50 USC 3605 -C December 7S • CRYPTOLOG • Page 7 f amctl II 1•11 1511 11n 1erm111 111••••• ••- I I I - -•f •• - EO 3 3b 3 PL 86-3 6 50 use 3605 11Nllll lll•MW al•• li•111••---111111 lll lll lf Llllllll l JJl ll ll lll• 1a11•11111111111111Bl IIIIIJIJlllll O Ulllil J • - _ _ _ _ _ _ _ I No n - Resp on sive I EO 3 3b 3 PL 86-36 50 USC 3605 •er fHiODUIII GUBIU THE GREAT SOVIET ·sHIPBUILDING MYSTERY · David H Williams P 16 ' _ r December 7S ' CRYPTOLOG • Page Zl 'ESP i'IHi'llf IJP IBM __ - - •-• s - -• ••- ----- --· EO 3 3b 3 PL 86-36 50 use 3605 lfttP iliiRlilf IJ IIIR z Any horrible example is worth repeating if it has some instructional value And the moral of this incident is no less true today than it was then Remember that in the Soviet Union too engineers don't do things the way anybody etse does BEh the name of tile letter and VEh u we ordinary telephone uaera have i11 di• tingui•hiog between Engli• h em and en Bat the trao•criber of Russian voice ha • yel another problem those Rn•• ian engineerw again The -me• of Latia Editor'• note Ru••ian pliooelic alphabet like Engli•h onea letter• as • poken in R•••ian don't • oud like ay bes reduce ambigaig BORIS •ound• different from VLADIMIR • 11e al all lo • tead th11y are baaed on the French name• of the letter• Hence Latui H H pronoao ced by a Ru aaian engijuat a• 0 M• ry •Olllld• differeat from Nancy' Si11ce pb onetic alphabets are aot used univeraelly transcriber• of neer is not lilce the English aitch bat i• ASb French Ruaeiao voice often h • a much trouble distinguiehing between ache Y i• not 0 wye but IGREK French y grec December 75 CRYPTOLOG • Page 22 or 8Biltllff HUIR'