Patent · US Active

Cryptographic algorithm having a key-dependent masked computing step (SBOX call)

US10805066B2 · kind B2 · utility

0Cited by

3References

11Claims

0Family size

Assignee

GIESECKE+DEVRIENT MOBILE SECURITY GMBH · DE

Inventors

Sven Bauer · Vaterstetten, DE
Hermann Drexler · Munich, DE
Jürgen Pulkus · Hersbruck, DE

Key dates

Filing date	Dec 7, 2016
Grant date	Oct 13, 2020
Priority date	—
Expiry date	Dec 11, 2037

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/24
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A processor device has an executable implementation of a cryptographic algorithm implemented thereon, which algorithm is adapted to produce an output text from an input text employing a secret key K. The implementation of the algorithm comprises a key-dependent computing step S which comprises a key combination of input values x derived directly or indirectly from the input text with key values SubK derived directly or indirectly from the key; the key-dependent computing step S is represented by a table which is masked with input masking and/or output masking to form a masked table TabSSubK; and a new masked table TabSKneu is generated in the processor device.

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