The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 03, 2013
Filed:
Jun. 13, 2006
Henri Gilbert, Bures sur Yvette, FR;
Jacques Patarin, Versailles, FR;
Côme Berbain, Montrouge, FR;
France Telecom, Paris, FR;
Abstract
A method of generating a pseudorandom sequence of terms belonging to a finite body K of cardinal q≧2 intended to be used in a cryptographic procedure, said method comprising the iterative calculation, from an initialization n-tuple X=(X, X, . . . , X), where n≧2, of elements of K, of n-tuples X=(X, X, . . . , X) of elements of K (where i=1, 2, . . . ), each n-tuple Xbeing obtained on iteration number i in a predetermined manner at least from certain components Yof an m-tuple Y=(Y, Y, . . . , Y), where m≧n, of elements of K and the terms of said pseudorandom sequence being extracted in a predetermined manner from the n-tuples X and/or the m-tuples Y. For at least one value of i, among said components Yof the m-tuple Ythat are used to obtain the multiplet X, at least E(n/2) of them are each represented by a predetermined second degree polynomial function, with coefficients in K, of the components of the n-tuple X.