Anti-Tamper Digital Clocks - An Overview
Anti-Tamper Digital Clocks - An Overview
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The past description on the disclosed embodiments is provided to enable any person experienced from the artwork to make or utilize the current creation. Various modifications to these embodiments will be readily clear to Those people qualified within the art, as well as generic principles described herein may very well be placed on other embodiments devoid of departing within the spirit or scope from the invention.
using the clock to trigger an Examine circuit that makes use of the plurality of delayed monotone alerts to detect a clock fault.
A small change resulting from regular environmental changes for example temperature will be in just a predetermined detection threshold. A big variation in violations on account of tampering (frequency and/or voltage) is going to be beyond the predetermined detection threshold.
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26. The method for detecting voltage tampering as described in claim 23, wherein the Appraise circuit decides regardless of whether the number of ones from the plurality of delayed monotone indicators differs from the water level selection by more than a predetermined threshold.
The measures of a way or algorithm explained in reference to the embodiments disclosed herein may very well be embodied straight in components, or in a mix of hardware and a program module executed by a processor. A software module might reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, tough disk, a detachable disk, a CD-ROM, or almost every other kind of storage medium recognized inside the art.
What on earth is claimed is: 1. A method for detecting clock tampering, comprising: offering a plurality of resettable hold off line segments, whereby resettable hold off line segments involving a resettable hold off line section affiliated with a minimum hold off time and a resettable delay line section connected to a most hold off time are Every connected to discretely raising hold off situations;
Resettable delay line segments between a resettable hold off line segment linked to a minimum delay time along with a resettable hold off line section associated with a optimum hold off time are Every single affiliated with discretely escalating hold off occasions. An Appraise circuit is induced by a clock and takes advantage of the plurality of delayed monotone alerts to detect a voltage fault.
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39. The equipment for detecting voltage tampering as outlined in declare 37, wherein the evaluate circuit is induced by a clock edge at an stop of the Examine period of time.
a first plurality of resettable hold off line segments that each hold off the first monotone sign to generate a respective first plurality of delayed monotone signals, whereby resettable hold off line segments involving a resettable delay line segment linked to a minimum amount hold off time along with a resettable delay line phase linked to a utmost hold off time are Just about every related to discretely escalating delay moments;
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A monotone signal is presented throughout an Consider time period. The monotone sign is delayed utilizing Each individual from the plurality of resettable hold off line segments to produce a respective plurality of delayed monotone alerts. A clock is accustomed to induce an Appraise circuit that works by using the plurality of delayed monotone indicators to detect a voltage fault.
an Appraise circuit, activated by here a clock, that utilizes the plurality of delayed monotone signals to detect a voltage fault.