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    • 27. 发明授权
    • Protected clock management based upon a non-trusted persistent time source
    • 基于不可信持久时间源的受保护的时钟管理
    • US08327448B2
    • 2012-12-04
    • US11158968
    • 2005-06-22
    • Avigdor EldarOmer Levy
    • Avigdor EldarOmer Levy
    • G06F21/00
    • G06F1/14G06F21/725
    • Methods and arrangements to persist a trusted time for a protected clock based upon a non-trusted but persistent time source are disclosed. Embodiments may comprise an embedded device, which may be hardware, software, firmware, and/or other logic, to maintain a trusted time in a protected clock. The embedded device may initialize the protected clock by obtaining a trusted time from a trusted time source such as a network server. The embedded device then maintains the trusted time in the event of a power loss to the protected clock by monitoring a time differential between the protected clock and a non-trusted system clock. Many embodiments also employ the protected clock without a battery backup to advantageously save manufacturing costs and space, while maintaining the trusted time in the event of a power loss by relying on a battery backup for the non-trusted system clock. Other embodiments are disclosed and claimed.
    • 公开了基于不可信但持久的时间源来保护受保护时钟的可信时间的方法和布置。 实施例可以包括嵌入式设备,其可以是硬件,软件,固件和/或其他逻辑,以将受保护的时钟中的可信时间保持在一起。 嵌入式设备可以通过从诸如网络服务器的可信时间源获得可信时间来初始化受保护的时钟。 然后,通过监视受保护时钟和不可信系统时钟之间的时间差,嵌入式设备在通过受保护时钟的功率损耗的情况下维持可信时间。 许多实施例还采用没有电池备份的受保护时钟,以有利地节省制造成本和空间,同时通过依赖于用于不可信系统时钟的电池备份来维持在功率损耗的情况下的可信时间。 公开和要求保护其他实施例。