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    • 2. 发明授权
    • Time varying presentation of items based on a key hash
    • 基于密钥散列的时间变化表示项目
    • US07246235B2
    • 2007-07-17
    • US09896088
    • 2001-06-28
    • Carl M. EllisonStephen H. Dohrmann
    • Carl M. EllisonStephen H. Dohrmann
    • H04L9/32H04L9/00
    • H04L9/3297H04L2209/043H04L2209/80
    • A method for key verification through time varying item presentation based on a key hash result comprises generating a key hash result partially based on both a global identifier provided from a source and an estimated current time at that source. After generating the key hash result, a first time-varying item is produced using the key hash result as an index for a table lookup or generated based on Certain bit patterns forming the key hash result. Thereafter, the first time-varying item is presented for comparison with a second time-varying item being contemporaneously presented at the source. These computations are repeated, giving the impression of two views or instances of the same time-varying item. An attacker might be able to match one small portion of such a time sequence of presentations, by luck, but not any large portion of the sequence.
    • 基于密钥散列结果的通过时变项目呈现的密钥验证的方法包括部分地基于从源提供的全局标识符和在该源处的估计当前时间两者来产生密钥散列结果。 在产生密钥散列结果之后,使用密钥哈希结果作为表查找的索引或基于形成密钥哈希结果的某些位模式生成的第一时变项目。 此后,提供第一时变项目以与在源处同时呈现的第二时变项目进行比较。 这些计算被重复,给出了两个视图或同一时间变化项目的实例的印象。 攻击者可能能够匹配这样一个时间序列的一小部分,通过运气,但不是序列的任何大部分。