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:
Aug. 01, 2017
Filed:
Mar. 28, 2013
Koninklijke Philips N.v., Eindhoven, NL;
Oscar Garcia Morchon, Aachen, DE;
Ludovicus Marinus Gerardus Maria Tolhuizen, Waalre, NL;
Jaime Gutierrez, Eindhoven, NL;
Sandeep Shankaran Kumar, Waalre, NL;
Domingo Gomez, Los Corrales, ES;
KONINKLIJKE PHILIPS N.V., Eindhoven, NL;
Abstract
A method of configuring a network device for key sharing and a method for a first network device to determine a shared key are provided. The method of configuring uses a private modulus (p) a public modulus (N), and a bivariate polynomial (f) having integer coefficients, the binary representation of the public modulus and the binary representation of the private modulus are the same in at least key length (b) consecutive bits. Local key material for a network device is generated by substituting an identity number into the bivariate polynomial and reducing modulo the private modulus the result of the substitution to obtain a univariate polynomial. Security may be increased by adding () one or more obfuscating numbers to coefficients of the univariate polynomial to obtain an obfuscated univariate polynomial. In a use phase, the network device determines a shared cryptographic key, by substituting () the identity number of another network device into the univariate polynomial and reducing modulo the public modulus and reducing modulo a key modulus.