公开(公告)号：US20010054163A1

公开(公告)日：2001-12-20

申请号：US09738893

申请日：2000-12-15

Applicant: ST Microelectronics S.A.

Inventor： Yannick Teglia

IPC: G11C029/00

CPC classification number: G06F21/6218 ,  G06F21/755 ,  G06F2207/7219

Abstract: A method is provided for secured transfer of an N-byte data element from a first memory containing the data element to a second memory through a data bus that is connected between the first memory -and the second memory. According to the method, a transfer rule is defined with at least one parameter whose value is chosen at random before each transfer of the data element. The N-byte data element is transferred byte-by-byte through the data bus in accordance with the transfer rule, with each byte transiting once and only once through the data bus. In a preferred method, the transfer rule is a permutation of the bytes of the N-byte data element. Also provided is a programmable circuit having a random number generator that supplies at least one parameter of a data transfer rule.

Abstract translation: 提供了一种通过连接在第一存储器与第二存储器之间的数据总线将N字节数据元件从包含数据元素的第一存储器固定地传送到第二存储器的方法。 根据该方法，传送规则被定义为在数据元素的每次传送之前至少有一个参数值被随机选择。 N字节数据元素按照传输规则通过数据总线逐字节传输，每个字节通过数据总线一次只进行一次。 在优选的方法中，传输规则是N字节数据元素的字节的置换。 还提供了一种具有提供数据传输规则的至少一个参数的随机数发生器的可编程电路。