Anti-Tamper Digital Clocks No Further a Mystery
Anti-Tamper Digital Clocks No Further a Mystery
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seventeen. The equipment for detecting clock tampering as defined in claim fifteen, whereby the Examine circuit is induced by a clock edge at an finish from the clock Assess time frame.
usually means for evaluating that uses the plurality of delayed monotone indicators to detect a voltage fault and
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Another delay line phase could have N hold off features that crank out the maximum delayed monotone signal 230-N. AND gates during the hold off lines could Each individual Have a very reset input RST to reset the road involving the delay elements to set the delay line to an First identified condition.
two. The tactic for detecting clock tampering as described in claim one, further more comprising: resetting the resettable hold off line segments during a reset time frame, wherein the reset period of time is ahead of the clock Consider period of time.
implies for delaying the monotone sign to generate a plurality of delayed monotone alerts acquiring discretely growing hold off instances between a least delay time and a optimum delay time and every of the plurality of delayed monotone alerts getting click here possibly a one particular or a zero logic price;
Additionally, an attack may perhaps decelerate the bus of the computation system to a lot more very easily assault the program.
Resettable hold off line segments among a resettable delay line section connected with a minimal hold off time in addition to a resettable hold off line section associated with a highest hold off time are Every single linked to discretely growing delay situations. An Consider circuit is brought on by a clock and employs the plurality of delayed monotone alerts to detect a voltage fault.
9. The equipment for detecting clock tampering as described in declare eight, further comprising: signifies for resetting the suggests for delaying the monotone signal for the duration of a reset time period, whereby the reset time period is prior to the clock evaluate period of time.
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eleven. The equipment for detecting clock tampering as defined in claim 8, whereby-the suggests for assessing establishes whether or not the amount of ones within the plurality of delayed monotone alerts differs from the water level amount by over a predetermined threshold.
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The reset period of time may very well be ahead of the clock Assess period of time 310. Using the clock CLK to cause the evaluate circuit 240 could make use of a clock edge at an finish on the clock Examine time period to set off the Assess circuit.