公开(公告)号：US10699030B2

公开(公告)日：2020-06-30

申请号：US15533845

申请日：2015-11-23

Applicant: CRYPTOGRAPHY RESEARCH, INC.

Inventor： Jeremy Samuel Cooper

IPC: G06F21/75 ,  G06F21/72 ,  H04L9/06 ,  H04L9/00

Abstract: Systems and methods for determining cryptographic operation masks for improving resistance to external monitoring attacks. An example method may comprise: selecting a first input mask value, a first output mask value, and one or more intermediate mask values; based on the first output mask value and the intermediate mask values, calculating a first transformation output mask value comprising two or more portions, wherein concatenation of all portions of the first transformation output mask value produces the first transformation output mask value, and wherein exclusive disjunction of all portions of the first transformation output mask value is equal to the first output mask value; and performing a first masked transformation based on the first transformation output mask value and the first input mask value.

公开(公告)号：US11507705B2

公开(公告)日：2022-11-22

申请号：US16896737

申请日：2020-06-09

Applicant: CRYPTOGRAPHY RESEARCH, INC.

Inventor： Jeremy Samuel Cooper

IPC: H04L9/00 ,  G06F21/75 ,  G06F21/72 ,  H04L9/06

Abstract: Systems and methods for determining cryptographic operation masks for improving resistance to external monitoring attacks. An example method may comprise: selecting a first input mask value, a first output mask value, and one or more intermediate mask values; based on the first output mask value and the intermediate mask values, calculating a first transformation output mask value comprising two or more portions, wherein concatenation of all portions of the first transformation output mask value produces the first transformation output mask value, and wherein exclusive disjunction of all portions of the first transformation output mask value is equal to the first output mask value; and performing a first masked transformation based on the first transformation output mask value and the first input mask value.

公开(公告)号：US20180167196A1

公开(公告)日：2018-06-14

申请号：US15533845

申请日：2015-11-23

Applicant: CRYPTOGRAPHY RESEARCH, INC.

Inventor： Jeremy Samuel Cooper

IPC: H04L9/00 ,  G06F21/72 ,  G06F21/75 ,  H04L9/06

CPC classification number: G06F21/755 ,  G06F21/72 ,  G06F21/75 ,  H04L9/003 ,  H04L9/0625 ,  H04L9/0631 ,  H04L2209/04

Abstract: Systems and methods for determining cryptographic operation masks for improving resistance to external monitoring attacks. An example method may comprise: selecting a first input mask value, a first output mask value, and one or more intermediate mask values; based on the first output mask value and the intermediate mask values, calculating a first transformation output mask value comprising two or more portions, wherein concatenation of all portions of the first transformation output mask value produces the first transformation output mask value, and wherein exclusive disjunction of all portions of the first transformation output mask value is equal to the first output mask value; and performing a first masked transformation based on the first transformation output mask value and the first input mask value.