发明名称 |
METHOD AND APPARATUS FOR MAINTAINING SECURE TIME |
摘要 |
An exemplary method of maintaining secure time in a computing device is disclosed in which one or more processors implements a Rich Execution Environment (REE), and a separate Trusted Execution Environment (TEE). The TEE maintains a real-time clock (RTC) that provides a RTC time to the REE. A RTC offset is stored in non-volatile memory, with the RTC offset indicating a difference between the RTC time and a protected reference (PR) time. Responsive to a request from the REE to read the RTC time, a current RTC time is returned to the REE. Responsive to a request from the REE to adjust the RTC time, the RTC time and the corresponding RTC offset are adjusted by a same amount, such that the PR time is not altered by the RTC adjustment. An exemplary computing device operable to implement the method is also disclosed. |
申请公布号 |
EP2901362(A1) |
申请公布日期 |
2015.08.05 |
申请号 |
EP20130759759 |
申请日期 |
2013.09.11 |
申请人 |
ST-ERICSSON SA |
发明人 |
STÅHL, PER;ENGLUND, HÅKAN;HOVANG, MARTIN;SIBERT, HERVÉ |
分类号 |
G06F21/72;G06F1/14;G06F21/74 |
主分类号 |
G06F21/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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