Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1991-07-17
1994-03-08
Heckler, Thomas M.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
H04L 900
Patent
active
052935779
ABSTRACT:
Method and apparatus for preventing inadmissible deviations from the runtime protocol of an application in a data exchange system. The data exchange system has, for example, a terminal T and a chip card K. For various applications (for example, automatic teller unit, computer access), basic functions B stored in the chip card K are processed in a sequence respectively defined in a protocol. Since the basic functions B are called in proceeding from the terminal T, the data integrity could be deteriorated by intentional modifications of the protocol sequence at the terminal T. By storing the allowable protocols in a control list STL and establishing a status memory area ZS on the chip card K, it becomes possible to monitor the protocol execution on the chip card K independently of the terminal T. The respective status Z of an application is fixed in the status memory area ZS. All basic function designations Bn permitted for a status Z are deposited in the control list STL.
REFERENCES:
patent: 4816654 (1987-11-01), Anderl et al.
patent: 4974193 (1990-11-01), Beutelspacher et al.
patent: 4985921 (1991-01-01), Schwartz
patent: 5045849 (1991-09-01), Willhaus
patent: 5048085 (1991-09-01), Abraham et al.
patent: 5073852 (1991-12-01), Siegel et al.
patent: 5093862 (1992-03-01), Sewartz
patent: 5148481 (1992-09-01), Abraham et al.
Chiopkarten-klein im Format, gross in der Leistung, Dietrich Kruse Telcom Report 11, 1988, No. 6, pp. 226-228.
Handbuch der modernen Datenverarbeitung, Einsatzmoeglichkeiten der Chipkarte, No. 136, Jul. 1987, Forkel Verlag, pp. 114-123.
Hueske Thomas
Jost Hildegard
Mueller Klaus
Pfau Axel
Heckler Thomas M.
Siemens Nixdorf Informationssysteme AG
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