公开(公告)号：US20210194689A1

公开(公告)日：2021-06-24

申请号：US17129688

申请日：2020-12-21

Applicant: STMICROELECTRONICS S.r.l.

Inventor： Ruggero SUSELLA ,  Filippo MELZANI ,  Guido Marco BERTONI

IPC: H04L9/30 ,  H04L9/14 ,  H04L9/08

Abstract: A method performs cryptographic operations on data in a processing device. An iterative operation between a first operand formed by a given number of words and a second operand using a secret key is performed. The iterative operation includes, for each bit of the secret key, applying one of a first set operations and a second set of operations to the first operand and to the second operand depending on of the bit, and conditionally swapping words of the first and the second operand based on a control bit value obtained by applying a logic XOR function to a random bit.