Patent · US Active

Securing a cryptographic device

US10567155B2 · kind B2 · utility

2Cited by

5References

20Claims

0Family size

Assignee

NXP B.V. · NL

Inventors

Marcel Medwed · Graz, AT
Ventzislav Nikov · Haasrode, BE
Martin Feldhofer · Gratwein-Straßengel, AT

Key dates

Filing date	Apr 29, 2016
Grant date	Feb 18, 2020
Priority date	—
Expiry date	Dec 4, 2036

Classification

Technology area (CPC H)Electricity
CPC primaryH04L63/123
WIPO fieldDigital communication
WIPO sectorElectrical engineering

Abstract

Methods of securing a cryptographic device against implementation attacks are described. A disclosed method comprises the steps of: generating secret values (324) using a pseudorandom generator (510); providing a key (330), an input (324) having a number of chunks and the secret values to an encryption module (340); indexing the chunks and the secret values (324); processing the input chunk wise by encrypting the secret values (324) indexed by the chunks using the key (330) and the encryption module (340); generating for each chunk a pseudorandom output (330′) of the encryption module (340), providing the pseudorandom output as the key (330′) when processing the next chunk; and performing a final transformation on the last pseudorandom output (330′) from the previous step by using it as a key to encrypt a fixed plaintext.

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