References M-209



further reading

j. reeds, d. ritchie, r. morris, hagelin cipher machine (m-209): cryptanalysis ciphertext alone , unpublished technical memorandum, bell laboratories, 1978. submitted cryptologia ([1]).
barker, wayne g. (1977). cryptanalysis of hagelin cryptograph. aegean park press. isbn 978-0-894-12022-0. oclc 3902917. 






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