Cryptography – Cryptanalysis
Patent
1991-01-03
1992-11-17
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 6, 380 49, H04K 110, H04L 900
Patent
active
051650983
ABSTRACT:
System for protection against remote access to digital equipment (1) emitting stray electromagnetic radiation (2) and operating with digital signals under clock control and being based on the representation of a given set of characters, comprising means (18, 19) for emitting protective electromagnetic radiation covering the frequency spectrum of said stray radiation. A store (14) for a character set comprises at least some of the characters in said given set of characters, and means (13) are included for selecting characters in random order from the store (14). The selected characters are applied to drive means (15, 16, 18) which are adapted to generate digital signals corresponding to the selected characters and modulated in a manner corresponding to the digital signals of the equipment (1) so as to be of substantially the same nature as these. Drive means (15, 16, 18) are adapted to emit, preferably continuously, the generated digital signals to an antenna (19) for radiating corresponding protective electromagnetic radiation.
REFERENCES:
patent: 3174118 (1965-03-01), Moore
patent: 3887772 (1975-06-01), Miller
patent: 4208545 (1980-06-01), Zenner
patent: 4563546 (1986-01-01), Glitz
patent: 4932057 (1990-06-01), Kolbert
Gregory Bernarr E.
System Sikkerhet A/S
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