The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 2014
Filed:
May. 19, 2012
Mohit Arora, Faridabad, IN;
Rakesh Pandey, Indirapuram, IN;
Pushkar Sareen, Nitya Nand Marg, IN;
Prashant Bhargava, Gurgaon, IN;
Mohit Arora, Faridabad, IN;
Rakesh Pandey, Indirapuram, IN;
Pushkar Sareen, Nitya Nand Marg, IN;
Prashant Bhargava, Gurgaon, IN;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A tamper detector has input and output pins for connection to ends of a tamper detection circuit, and a corresponding set of linear feedback shift registers (LFSRs) timed by clock signals for generating pseudo-random coded detection signals as a function of seed values and of a generator polynomial defined by feedback taps. A comparator compares signals received from the detection circuit with the coded detection signals. A multiplexer provides the coded detection signal selectively from the LFSRs to the output pin and the comparator. A controller varies the seed values for different cycles of values of the pseudo-random coded detection signals. The controller also controls the generator polynomial and a frequency of the clock signals for different cycles of values of the pseudo-random coded detection signals.