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    • 57. 发明公开
    • CRYPTOGRAPHICALLY SECURE PSEUDO-RANDOM NUMBER GENERATOR
    • 克里斯托弗·克里斯托弗
    • EP1927214A1
    • 2008-06-04
    • EP06836108.8
    • 2006-08-24
    • Qualcomm Incorporated
    • ROSE, Gregory GordonGANTMAN, AlexanderXIAO, Lu
    • H04L9/22
    • G06F7/588G06F7/58H04L9/0662H04L2209/043H04L2209/24
    • A cryptographically secure pseudo-random number generator is configured to obtain one or more unpredictable sources of entropy that provide a seed. A current internal state of the number generator is modified as a function of the current internal state and the seed to accumulate entropy. The modified internal state may be obtained by using non-linear feedback shift register operations on the internal state and the seed. A pseudo-random number is then generated based on the modified internal state of the number generator. The one or more unpredictable sources of entropy may be combined into the seed. The internal state of the number generator may be continually modified with additional seeds obtained from the one or more unpredictable sources and the current internal state. Additionally, the internal state of the number generator may be modified on demand with a new seed received from a calling application.
    • 密码安全的伪随机数发生器被配置为获得提供种子的一个或多个不可预知的熵源。 数字发生器的当前内部状态被修改为当前内部状态和种子以累积熵的函数。 可以通过在内部状态和种子上使用非线性反馈移位寄存器操作来获得修改的内部状态。 然后基于数字发生器的修改的内部状态生成伪随机数。 一个或多个不可预测的熵源可以组合到种子中。 可以使用从一个或多个不可预测的源获得的附加种子和当前的内部状态来连续修改号码发生器的内部状态。 此外,可以根据需要修改号码发生器的内部状态,并从呼叫应用程序接收到新的种子。