Patent · US Active

Method and system for protecting execution of cryptographic hash functions

US9443091B2 · kind B2 · utility

4Cited by

0References

25Claims

0Family size

Assignee

IRDETO B.V. · NL

Inventors

Jonathan Emmett · Ottawa, CA
Philip Allan Eisen · Ottawa, CA
James Muir · Ottawa, CA
Daniel Murdock · Victorville, US

Key dates

Filing date	Mar 31, 2011
Grant date	Sep 13, 2016
Priority date	—
Expiry date	Aug 30, 2031

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/16
WIPO fieldComputer technology
WIPO sectorElectrical engineering

Abstract

A method of protecting the execution of a cryptographic hash function, such as SHA-256, in a computing environment where inputs, outputs and intermediate values can be observed. The method consists of encoding input messages so that hash function inputs are placed in a transformed domain, and then applying a transformed cryptographic hash function to produce an encoded output digest; the transformed cryptographic hash function implements the cryptographic hash function in the transformed domain.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.