Method and system for writing information in a data carrier making it possible to later certify the originality of this information
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United States of America Patent
Stats
-
Aug 18, 1998
Issued Date -
N/A
app pub date -
May 7, 1997
filing date -
Oct 27, 1992
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The invention consists of writing at least one piece of information ?I! and an image ?I'! thereof into the accessible memory zone Ac of a portable object (1). This image ?I'! is obtained by implementing a program of encipherment of the information ?I!. This program takes into account at least the one piece of information ?I!, a first datum ?Ks! that is external to the portable object and furnished to encipherment circuits (21) under the control of the person writing the information, and a second datum ?Sid! that is diversified for each portable object (1). Later certification consists of verifying that an image ?I'! has been obtained with the aid of the first and second data, so as to deduce from this that the associated information ?I! is original.
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Cited Art Landscape
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