TAMPER-RESISTANT TIME REFERENCE AND APPARATUS USING SAME
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United States of America Patent
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Issued Date -
Jan 8, 2009
app pub date -
Jan 16, 2006
filing date -
Jan 18, 2005
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A tamper-proof reference usable as a time reference and an integrated circuit apparatus using the tamper-proof reference to determine an elapsed time are disclosed. The circuit comprises a reference source (200) contained in an integrated package comprising a radioactive material (210), a measurement circuit (220) in contact with the radioactive material (210), the measurement circuit for collecting for a predetermined period radiation generated by the radioactive material (210) and a processor (110) in communication with the reference (200), the processor (110) for initiating a measurement by the reference (200) and for determining an elapsed time based on a plurality of measurements by the reference (200).
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