公开(公告)号：WO03024017A2

公开(公告)日：2003-03-20

申请号：PCT/FR0203007

申请日：2002-09-04

Applicant: ST MICROELECTRONICS SA ,  SAGEM ,  LIARDET PIERRE-YVAN ,  CHABANNE HERVE

Inventor： LIARDET PIERRE-YVAN ,  CHABANNE HERVE

IPC: H04L9/10 ,  H04L9/06

CPC classification number: H04L9/0625 ,  G06F2207/7219 ,  H04L9/004

Abstract: The invention concerns a method and a system for making secure a secret quantity, contained in an electronic device, and used at least partly in an encryption algorithm of at least part of an input data executing a predetermined number (N) of successive iterations of a common function and producing at least part of an output data, which consists in: storing (14), after a first number (X) of iterations, an intermediate result; applying, to the output data, a function inverse to that of the encryption for a number (N-X) of iterations corresponding to the difference between the total number of iterations and the first number; comparing (18) the intermediate result with the result of iterations of the inverse function; and validating the encryption only if the two results are identical.

Abstract translation: 本发明涉及一种用于制作安全秘密数量的方法和系统，其包含在电子设备中，并且至少部分地用于执行预定数目（N）的连续迭代的输入数据的至少一部分的加密算法中， 公共函数并产生输出数据的至少一部分，其包括：在第一数目（X）的迭代之后存储（14）中间结果; 向输出数据应用与加密的函数相反的函数，用于对应于迭代总数与第一数目之间的差的迭代次数（N-X）; 将所述中间结果与所述反函数的迭代结果进行比较（18）; 并且只有在两个结果相同的情况下才验证加密。

公开(公告)号：FR2829331B1

公开(公告)日：2004-09-10

申请号：FR0111430

申请日：2001-09-04

Applicant: ST MICROELECTRONICS SA

Inventor： LIARDET PIERRE YVAN ,  CHABANNE HERVE

IPC: H04L9/10 ,  H04L9/06 ,  H04L9/32

公开(公告)号：FR2829331A1

公开(公告)日：2003-03-07

申请号：FR0111430

申请日：2001-09-04

Applicant: ST MICROELECTRONICS SA

Inventor： LIARDET PIERRE YVAN ,  CHABANNE HERVE

IPC: H04L9/10 ,  H04L9/06 ,  H04L9/32

Abstract: A chip card key security system compares (18) a stored (14) intermediate result after X iterations and a random delay with the inverse result from the rest of the N iteration sequence and only confirms the encryption if the results are compatible.