Physically unclonable function (PUF) with improved error correction
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United States of America Patent
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Jul 19, 2016
Grant Date -
Oct 30, 2014
app pub date -
Nov 23, 2012
filing date -
Dec 6, 2011
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Abstract
A cryptographic system for reproducibly establishing a reliable data string, such as a cryptographic key, from a noisy physically unclonable function (PUF, 110) is provided. The system comprises a hard decision decoder (150) to decode a first multiple of error correctable data words to obtain a second multiple of corrected and decoded data words and a reliability information extractor (180) to determine reliability information, e.g. soft decision information, that is indicative of a reliability of corrected and decoded data words. The system further comprises a soft decision decoder (160) configured to use the reliability information to decode at least one further correctable data word. Error correcting a PUF using reliability information decreases the false rejection rate.
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