Server apparatus, communication system, and data issuing method
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United States of America Patent
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Sep 4, 2018
Grant Date -
Dec 18, 2014
app pub date -
Jun 11, 2014
filing date -
Jun 12, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
There is a server apparatus in which: an issuing unit issues data to devices; a distribution manager distributes the data to devices; a data manager manages data set as issued; a revocation manager detects, from the data set, data that satisfies a condition, and invalidates the detected data; and a filter manager updates and distribute to devices a filter having a predetermined bit length each time data is invalidated, by setting one of a first value and a second value to each of bits in the filter when a revoked data set is projected onto the filter; the data manager identifies data other than the invalidated data, having projection onto at least one of bits whose value has changed between before and after the update, and having the first value for all of bits projected onto the updated filter and reissues data to the device having the identified data.
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