Cryptography – Cryptanalysis
Patent
1994-12-30
1997-07-01
Gregory, Bernarr E.
Cryptography
Cryptanalysis
380 3, 380 9, 380 23, 380 25, 380 49, 380 50, 34082531, 34082534, 395 3, H04L 900
Patent
active
056446365
ABSTRACT:
A method and apparatus for securing data stored in semiconductor memory cells of a semiconductor device is described. A reference fingerprint corresponding to numerical representations of a measurement of the levels of charges trapped in the memory cells is generated and stored. The measurement is performed immediately after programming data to the memory cells. The reference fingerprint is then compared to a measurement of numerical representations of the levels of charges trapped in the memory cells of a memory device that has been presented to a reader. If a match occurs, then the data stored in the memory device is authenticated. An intentional offset error voltage may be applied when writing data to the memory cells to enhance the security of the data. The reference fingerprint may also be encrypted prior to storage for added security. Lastly, fuzzy logic techniques may be used to compensate for environmental and hardware related fluctuations in the levels of trapped charges of the programmed memory cells.
REFERENCES:
patent: 4304961 (1981-12-01), Campbell, Jr.
patent: 4799635 (1989-01-01), Nakagawa
patent: 5058164 (1991-10-01), Elmer et al.
patent: 5343527 (1994-08-01), Moore
patent: 5421006 (1995-05-01), Jablon et al.
Gregory Bernarr E.
XTec Incorporated
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