Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1995-03-09
1999-02-02
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 24, 380 25, 380 30, 380 49, 235379, 235380, H04L 900, H04L 930
Patent
active
058675779
ABSTRACT:
A method and an apparatus for authenticating a data carrier enables a transaction or access to a service or a location, and the corresponding carrier. The carrier (1) has a specific number (Ns) and an authentication value calculated from the specific number and from information (I) that defines the rights attaching to the carrier by means of an asymmetrical algorithm (F) and a secret key (Ks). Two types of authentication are provided. One is current, in a mode disconnected from the authorizing organization. The other is periodic, in a connected mode. In the disconnected mode, an algorithm (G) correlated with the asymmetrical algorithm (F) and using a public key (Kp) is applied to the authentication value (VA), read from the carrier, in order to verify that the authentication value (VA) is compatible with the specific number (Ns) and the information (I), and that the transaction or service requested is compatible with the information (I). In the connected mode, it is also possible to modify the authentication value of the carrier.
REFERENCES:
patent: 4453074 (1984-06-01), Weinstein
patent: 4910774 (1990-03-01), Barakat
Bull CP8
Gregory Bernarr E.
Kondracki Edward J.
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