Detection of a disturbance in a calculation performed by an integrated circuit
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United States of America Patent
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Apr 3, 2012
Grant Date -
Jan 24, 2008
app pub date -
Dec 28, 2006
filing date -
Dec 29, 2005
priority date (Note) -
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Abstract
A method for detecting a disturbance of a calculation, by an electronic circuit, of a result of an integral number of applications of an internal composition law on elements of an abelian group, by successive iterations of different steps according to the even or odd character of a current coefficient of a polynomial representation of said integral number, the degree of which determines the number of iterations, each iteration including: in case of an odd current coefficient, updating at least one first variable intended to contain the result at the end of the calculation; and in case of an even current coefficient, of updating a second variable and a comparison of this second variable with an expected value.
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