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:
Feb. 18, 2020
Filed:
Apr. 29, 2016
Nxp B.v., Eindhoven, NL;
NXP B.V., Eindhoven, NL;
Abstract
Methods of securing a cryptographic device against implementation attacks are described. A disclosed method comprises the steps of: generating secret values () using a pseudorandom generator (); providing a key (), an input () having a number of chunks and the secret values to an encryption module (); indexing the chunks and the secret values (); processing the input chunk wise by encrypting the secret values () indexed by the chunks using the key () and the encryption module (); generating for each chunk a pseudorandom output (') of the encryption module (), providing the pseudorandom output as the key (′) when processing the next chunk; and performing a final transformation on the last pseudorandom output (′) from the previous step by using it as a key to encrypt a fixed plaintext.