Secure method of exchanging information messages
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United States of America Patent
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Issued Date -
Jun 3, 2004
app pub date -
Oct 3, 2003
filing date -
Oct 7, 2002
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A secure method of exchanging information messages sent successively from a sending platform to a receiving platform includes: a) an initialization sequence in which an initialization message M.sub.0 containing information relating to a date t.sub.1 for sending a first information message M.sub.1 is exchanged between the sending platform and the receiving platform, and b) an information message transmission sequence in which: the information messages are sent successively by the sending platform at given time intervals .DELTA.T.sub.E, each message M.sub.n being coded by means of a dynamic code C.sub.n specific to the date t.sub.n of sending the message, and the messages received by the receiving platform are processed as a function of their reception date t.sub.r so that the messages received in an observation window F.sub.n in the vicinity of t.sub.n are decoded using a decoding sequence DC.sub.n adapted to decode the dynamic code C.sub.n, the clock of the receiving platform being synchronized to the date t.sub.1 on receiving the first message M.sub.1.
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