公开(公告)号：US20010025344A1

公开(公告)日：2001-09-27

申请号：US09738548

申请日：2000-12-15

Applicant: STMicroelectronics SA.

Inventor： Yannick Teglia

IPC: G06F011/30

CPC classification number: G06F21/6218 ,  G06F21/755 ,  G06F2207/7219 ,  G06F2221/2123

Abstract: A method is provided for secured transfer of data 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 secret N-byte data element is transferred byte-by-byte through the data bus, with each byte transiting at least once on the data bus. Before each transfer of a byte of the secret data element, a current index ranging from 0 to Nnull1 is randomly chosen, with the current index corresponding to a place value of the byte to be transferred. At each transfer of a byte of the secret data element with a place value equal to the current index, a corresponding bit of an N-byte loading indicator is modified as a function of a loading mode, with the loading mode being an integer ranging from 0 to a first constant. The transfer of the secret data element is ended when the loading indicator takes a predetermined value.

Abstract translation: 提供了一种通过连接在第一存储器和第二存储器之间的数据总线将数据从包含数据元素的第一存储器安全地传送到第二存储器的方法。 根据该方法，秘密的N字节数据元素通过数据总线逐字节传送，每个字节在数据总线上至少一次传输一次。 在秘密数据元素的一个字节的每次传送之前，随机选择范围从0到N-1的当前索引，其中当前索引对应于要传送的字节的位置值。 在每个传输具有等于当前索引的位置值的秘密数据元素的一个字节的字节时，N字节加载指示符的相应位被修改为加载模式的函数，其中加载模式是从 0到第一个常数。 当加载指示符取预定值时，秘密数据元素的传送结束。