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.AlllED J'OR:ES SECUB1'ft' W.ASBilUl'ON 25 I D. c. COUBSE IN Tiii!: CR!PJ?ABALYSIS OF MACHDE CIPBEBS - "ZZ" SBRIBS ***** '!be 35 messages comprising this problem wen selected from a lm'ge amount ot homopDeous traffic because they h8l1 iaentical indicators, aDd tbaref'OJ:9" l.ibly to be in cryptogrep'b.ic depth. 'fbeae masages wre intercepted on e4m.1Diat1"ative nets 1 an4 be a;pected to begin vi th the apen1Dg stereotypes often f'oulld in adm1n1,atratin traffic. Sol.ve the cipher texts ot the •asages, recove.r tbe alphabets in- volved, and reconstruct all. elemnt• ot tbe particu1a:r -.chine. 'l?ra1Ding Division ll Jfebruar7 l.952 Declassified and approved for release by NSA on 05-19-2014 pursuant to E.O. 1352e RESTRICTED
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COURSE IN THE CRYPTANALYSIS OF MACHINE CIPHERS - 'ZE ...

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Page 1: COURSE IN THE CRYPTANALYSIS OF MACHINE CIPHERS - 'ZE ...

.AlllED J'OR:ES SECUB1'ft' ~ W.ASBilUl'ON 25 I D. c.

COUBSE IN Tiii!: CR!PJ?ABALYSIS OF MACHDE CIPBEBS - "ZZ" SBRIBS

*****

'!be 35 messages comprising this problem wen selected from a lm'ge

amount ot homopDeous traffic because they h8l1 iaentical indicators,

aDd tbaref'OJ:9" l.ibly to be in cryptogrep'b.ic depth. 'fbeae masages wre

intercepted on e4m.1Diat1"ative nets 1 an4 ~ be a;pected to begin vi th

the apen1Dg stereotypes often f'oulld in adm1n1,atratin traffic.

Sol.ve the cipher texts ot the •asages, recove.r tbe alphabets in­

volved, and reconstruct all. elemnt• ot tbe particu1a:r -.chine.

'l?ra1Ding Division ll Jfebruar7 l.952

Declassified and approved for release by NSA on 05-19-2014 pursuant to E.O. 1352e

RESTRICTED

Page 2: COURSE IN THE CRYPTANALYSIS OF MACHINE CIPHERS - 'ZE ...

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