Time varying presentation of items based on a key hash
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United States of America Patent
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Jul 17, 2007
Grant Date -
Jan 16, 2003
app pub date -
Jun 28, 2001
filing date -
Jun 28, 2001
priority date (Note) -
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status (Latency Note)
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Abstract
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.
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