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:
Apr. 07, 2020
Filed:
Oct. 28, 2016
Giesecke+devrient Mobile Security Gmbh, München, DE;
GIESECKE+DEVRIENT MOBILE SECURITY GMBH, München, DE;
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.