Cryptography – Electric signal modification – Having mechanical control of signal encryption
Reexamination Certificate
1944-12-15
2001-01-16
Gregory, Bernarr E. (Department: 3662)
Cryptography
Electric signal modification
Having mechanical control of signal encryption
C380S287000, C380S052000, C380S056000, C380S057000, C380S059000, C341S050000, C341S090000, C341S091000
Reexamination Certificate
active
06175625
ABSTRACT:
This invention relates to electrical circuits for controlling the operation of the mechanical elements of a cryptographic machine.
Among the several objects of this invention are:
To provide means for changing the circuits of a cryptographic machine to condition them for enciphering, deciphering or writing plain text and numerals;
To devise circuits to control the mechanical operating elements of a cryptographic machine to introduce a very high degree of complexity and unpredictability into the selection of such elements for operation;
To provide means for cutting out the ciphering circuits and cutting in circuits for controlling the mechanical operation only;
To provide a switch having four operating positions to condition the circuits in groups to perform different functions requisite in the electromechanical encipherment and decipherment of messages;
To devise a second switch to cooperate with the aforesaid switch in condition circuits to separate purely mechanical functions of a cryptographic machine from those involved in recording textual matter.
REFERENCES:
patent: 1540107 (1925-06-01), Damm
patent: 2116683 (1938-05-01), Lemmon et al.
patent: 2116731 (1938-05-01), Noll
Safford Laurance F.
Seiler Donald W.
Gregory Bernarr E.
The United States of America as represented by the National Secu
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