Data carrier and write/read device therefor

Details Data carrier and write/read device therefor Data carrier and write/read device therefor

1995-10-30

1998-08-04

Cangialosi, Salvatore

Cryptography

Equipment test or malfunction indication

H04L 900

Patent

active

057906629

ABSTRACT:
A data carrier with an electronic circuit for storing and processing data is provided with an information strip with optically readable markings, and preferably a test field and an authentication feature. An optical interface, for example, can be provided for communication with a write/read device. The markings represent a digital signature. Testing of the authenticity of the data carrier can be done on the basis of the physical properties of the markings, the internal structure of the signature and/or the proof that a test number stored in the electronic circuit is equal to a number calculated from the signature according to a pre-determined function. The signature can also serve as a cryptographic key for encoding and decoding the data to be exchanged between the electronic circuit and the write/read device. The test field can be irreversibly modified when the data carrier is used. The write/read device contains an optical reading head for machine reading the markings and is optionally connected to a data processing point by means of a communication network.

REFERENCES:
patent: 4034211 (1977-07-01), Horst et al.
patent: 5027401 (1991-06-01), Soltesz
patent: 5546462 (1996-08-01), Indeck et al.
patent: 5548106 (1996-08-01), Liang et al.
patent: 5613012 (1997-03-01), Hoffman et al.

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