公开(公告)号：US20150242336A1

公开(公告)日：2015-08-27

申请号：US14423273

申请日：2013-09-16

Applicant: ST-Ericsson SA

Inventor： Chris Loreskär ,  Jens Wiklander

IPC: G06F12/14 ,  G06F7/58

CPC classification number: G06F12/1466 ,  G06F7/582 ,  G06F21/72 ,  G06F21/74 ,  G06F2212/1052

Abstract: Data, such as usage restriction data (3), are stored in a memory (2) of an electronic device (1). When new data (3) is determined, a number of previously stored random data files (4) are transferred to a secure execution environment (7), in which a number of further random data files and a random seed are generated. A series for selecting some previously stored data files and some further data files is created, and a checksum over the selected files is calculated. The random seed is stored with the data, and an authentication code thereof is calculated using the checksum. The updated data and the generated further data files are returned from said secure execution environment (7), and the further data files replace a corresponding number of the previously stored data files according to the created series. The updated data is stored in the memory (2).

Abstract translation: 诸如使用限制数据（3）的数据被存储在电子设备（1）的存储器（2）中。 当确定新数据（3）时，先前存储的多个随机数据文件（4）被传送到其中产生多个随机数据文件和随机种子的安全执行环境（7）。 创建一系列用于选择一些以前存储的数据文件和一些其他数据文件，并计算所选文件的校验和。 随机种子与数据一起存储，并且使用校验和计算其认证码。 从所述安全执行环境（7）返回更新的数据和所生成的其他数据文件，并且根据所创建的系列，进一步的数据文件替换相应数量的先前存储的数据文件。 更新的数据被存储在存储器（2）中。