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:
Mar. 24, 2020
Filed:
Dec. 20, 2017
Nxp B.v., Eindhoven, NL;
Marc Joye, San Jose, CA (US);
Fariborz Salehi, San Jose, CA (US);
NXP B.V., Eindhoven, NL;
Abstract
A method for performing a secure comparison between a first secret data and a second secret data, including: receiving, by a processor of a first party,encrypted bits of the second secret data y from a second party, whereis an integer; computing the Hamming weight h of first secret data x, wherein x hasbits; computing the value of a first comparison bit δsuch that δ=0 when h>└/2┘, δ=1 when h<┌/2┐, and δis randomly selected when h=/2; forming a set of └/2┘ indexesthat includes at least the indexes i where x=δ; selecting random invertible scalars rfor each i inand computingc*=(1+(1−2δ)x·y·(x⊕y))whereinwdenotes the homomorphic encryption of w using a cryptographic key of the second party; selecting random invertible scalars rand computingc*=(δ·x⊕y); transmitting ciphertextsc*in a random order to the second party.