Details

Autor(en) / Beteiligte

• Martin, Mitchell T

Titel

Physical Unclonable Functions Based on Delay Paths and an Interdigital Microstrip Notch Filter

Ort / Verlag

ProQuest Dissertations & Theses

Erscheinungsjahr

2020

Link zum Volltext

• ProQuest

Quelle

ProQuest Dissertations & Theses A&I

Beschreibungen/Notizen

• A Physical Uncloneable Function (PUF) is an integrated circuit hardware primitive that is designed to leverage naturally occurring variations to produce a random bitstring. The Aribiter (ARB) PUF is one of the first to be described in the literature. It derives its entropy from variations that occur in the delays of identically configured logic paths. The ARB PUF uses a phase comparator to decide which path of a pair is faster under a given challenge, and generates a 0 or 1 as a response indicator bit. Unfortunately, the ARB PUF is not reliable, requiring error correction in cases where the sequence of response bits (the bitstring) needs to be reproduced. In this proposal, a test structure is described, called a time-to-digital converter (TDC) that is capable of measuring the actual delays of the paths. This type of ’soft’ information can be used to improve the reliability of the ARB PUF. Data obtained from a set of chips fabricated in IBM’s 90 nm technology, and collected across 9 temperature-voltage (TV) corners, is used to demonstrate its effectiveness. Current PUF designs are typically implemented in silicon like the ARB PUF or utilize variations found in commercial off-the-shelf (COTS) parts. Because of this, existing designs are insufficient for the authentication of Printed Circuit Boards (PCBs). In this thesis, we also propose a novel PUF design that leverages board variations in a manufactured PCB to generate unique and stable identifiers (IDs) for each PCB. In particular, a single copper trace is used as a source of randomness for bitstring generation. The trace connects three notch filter structures in series, each of which is designed to reject specific but separate frequencies. The bitstrings generated with both the ARB PUF and the PCB PUF are evaluated using statistical tests which measure randomness, uniqueness and reliability.