METHOD FOR CRYPTOGRAPHIC PROCESSING OF A MESSAGE
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United States of America Patent
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Issued Date -
May 14, 2009
app pub date -
May 7, 2008
filing date -
May 7, 2007
priority date (Note) -
Abandoned
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Abstract
A method for cryptographic processing of a message by a secret key includes the following steps: determination of a third data item (a.sub.0) and a fifth data item (a.sub.1.sym.eCtrl), including calculation, as a function at least of a first data item (m) obtained from the message and a second data item (d) obtained from the secret key, of the third data item (a.sub.0) and a fourth data item (a.sub.1) linked by a verification relationship, and including obtaining the fifth data item (a.sub.1.sym.eCtrl) by combination of the fourth data item (a.sub.1) and a data item (eCtrl) representing the second data item (d); verification of the verification relationship between the third data item and a combination of the fifth data item and the second data item.
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