Patent · US Active

Alternative representation of the crypto-algorithm DES

US10615962B2 · kind B2 · utility

0Cited by

1References

20Claims

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	Oct 28, 2016
Grant date	Apr 7, 2020
Priority date	—
Expiry date	Jan 19, 2037

Classification

Technology area (CPC H)Electricity
CPC primaryH04L2209/16
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

A processor device has an executable implementation of the cryptographic algorithm DES implemented with an XOR linkage operation at the round exit and an implemented computation step S arranged to map expanded right input values r′ as computation step entry values x=r′ onto exit values s=S[x]. The computation step S is implemented as a key-dependent computation step further comprises a key linkage operation for linking input values of the round with key values of the round derived directly or indirectly from the key. The computation step S is implemented as a combined key-dependent computation step T which further comprises: a permutation operation P associated with the round, arranged to be applied to exit values s of the computation step S and to supply the exit values s of the computation step in permutated form to the XOR linkage operation at the round exit.

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