Folder and envelope marked "Swedish cipher machines, 1948" containing code breaker's notes and report on the safety of the Swedish cipher machines offered to the Department of External Affairs,

1948-1949.

Including typescript "Method of breaking the Swedish cipher machines" (3 pages), and typescript letter from Captain Michael Harrison, An Roinn Cosanta, 3 Jan. 1949, regarding the document on breaking the cipher, with reply from Hayes, 10 Jan. 1949.

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Bibliographic Details
Main Creator: Hayes, Richard J., 1902-1976
Contributors: Harrison, Michael, Captain
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Format: Manuscript
Language:English
Subjects:
Cryptographers > Ireland
Notes:Manuscript report and typescript copies.

Physical description: 1 folder.

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Arrangement:Sub-fond
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Folder and envelope marked "Swedish cipher machines, 1948" containing code breaker's notes and report on the safety of the Swedish cipher machines offered to the Department of External Affairs,

1948-1949.
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Bibliographic Details
In Collection: Richard J. Hayes Papers, 1902-1976.
Description:Including typescript "Method of breaking the Swedish cipher machines" (3 pages), and typescript letter from Captain Michael Harrison, An Roinn Cosanta, 3 Jan. 1949, regarding the document on breaking the cipher, with reply from Hayes, 10 Jan. 1949.
Main Creator: Hayes, Richard J., 1902-1976
Language:English
Extent:1 folder.
Format:Manuscript
Call Number: MS 22,983/20 (Manuscripts Reading Room)
Rights:Reproduction rights owned by the National Library of Ireland.
Corporate Author:Ireland. Department of External Affairs