Access-protected data carrier

Details Access-protected data carrier Access-protected data carrier

1999-09-07

2009-10-13

Colin, Carl (Department: 2433)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C380S028000, C380S029000, C713S189000

Reexamination Certificate

active

07602916

ABSTRACT:
The invention relates to a data carrier having a semiconductor chip (5) with at least one memory. The memory contains an operating program that is able to perform at least one operation (h). In order to prevent unauthorized access to the data (x) processed with the operation (h), both said data and the operation (h) itself are disguised. The disguising of the data (x) and the operation (h) is coordinated such that the disguised operation (hR1R, hR1R2) generates either the output data (y) of the undisguised operation (h) or disguised output data (y{circle around (x)}R2) from which the output data (y) can be determined.

REFERENCES:
patent: 4549075 (1985-10-01), Saada et al.
patent: 5153581 (1992-10-01), Hazard
patent: 2001/0053220 (2001-12-01), Kocher et al.
US 5,748,741, 05/1998, Johnson et al. (withdrawn)
Bruce Schneier, Applied Cryptography, 1996, John Wiley & Sons, Second Edition, pp. 349-353, 366-367.

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