Data exchange system with a check of the apparatus for its authentication status
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United States of America Patent
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May 31, 1994
Grant Date -
N/A
app pub date -
Dec 22, 1992
filing date -
Dec 24, 1991
priority date (Note) -
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status (Latency Note)
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Abstract
The invention relates to a data exchange system wherein the entitlement of a user is detected by a check of a personal feature inputted by the user, comprising a data carrier associated with the user, an apparatus communicating with the data carrier and a display unit. The data of the data carrier contain a data word known only to the user that, before he is asked to input his personal feature, is transmitted to the apparatus in an encoded form and displayed to the user for comparison after being decoded by a cryptographic unit contained in the apparatus and characterizing the authenticity of the apparatus.
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