Method of writing information securely in a portable medium
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United States of America Patent
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May 4, 1999
Grant Date -
N/A
app pub date -
Nov 12, 1996
filing date -
Mar 10, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of writing information securely in a portable information medium fitted with a firmware electronic component. According to the invention, information is written in at least two stages on at least two distinct sites, with information depending on the chosen second site being written in a first step at the first site, and with information necessary for operation of medium being written in a second step at the second site. Application to protecting portable media for electronic transactions against theft.
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