Signal generator based device security
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United States of America Patent
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Jan 14, 2014
Grant Date -
Oct 25, 2007
app pub date -
Jan 24, 2007
filing date -
Jan 24, 2006
priority date (Note) -
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Abstract
Subsets of multiple signal generator circuits embodied in a device are selected, and then a volatile value for the device is generated from the selected subsets. The volatile value may be used for authentication of the device and/or for cryptographic procedures performed on the device. The signal generator circuits may each comprise an oscillator circuit, and the selection of the subsets may be according to a comparison of the outputs of the subsets of circuits, for example, according to a comparison of output oscillation frequencies.
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