Method of counterfeit detection of electronic data stored on a d

Details Method of counterfeit detection of electronic data stored on a d Method of counterfeit detection of electronic data stored on a d

1997-02-25

1999-02-23

Cain, David

Cryptography

Cryptanalysis

H04K 100

Patent

active

058752480

ABSTRACT:
A nonvolatile memory is provided with a counterfeit detection mechanism by storing an encryption key and performing cryptographic operations on chip. The encryption key, which is stored in the nonvolatile memory in a protected manner such that it is never exported, is based on unique data within the nonvolatile memory. Unless an expected encryption key calculated from the unique data matches the stored encryption key, the system will not allow the resource containing the nonvolatile memory to be utilized. Equivalence of the expected and stored encryption keys is tested by enciphering and deciphering a random number. The data in the nonvolatile memory may be copied but not altered since each data block includes an electronic signature. Modification of the data in the nonvolatile memory as part of an effort to counterfeit the stored encryption key is therefore useless.

REFERENCES:
patent: 4887296 (1989-12-01), Horne
patent: 5381481 (1995-01-01), Gammie et al.
patent: 5495531 (1996-02-01), Smiedt
"Iterative Pin Generation," IBM Technical Disclosure Bulletion, vol. 29, No. 1, pp. 14-16 (Jun. 1986).

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