Method and apparatus for authenticating a data carrier intended to enable a transaction or access to a service or a location, and corresponding carrier
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United States of America Patent
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Feb 2, 1999
Grant Date -
N/A
app pub date -
Mar 9, 1995
filing date -
Mar 9, 1994
priority date (Note) -
In Force
status (Latency Note)
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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.
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