InterPUF: Distributed Authentication via Physically Unclonnable Functions and Multi-party Computation for Reconfigurable Interposers

By Ishraq Tashdid ¹, Tasnuva Farheen ², Sazadur Rahman ^1
1 University of Central Florida, Orlando, FL, USA,
² Louisiana State University, Baton Rouge, LA, USA

Abstract

Modern system-in-Packages (SiP) platforms are rapidly adopting reconfigurable interposers to enable plug-and-play chiplet integration across heterogeneous multi-vendor ecosystem. However, this flexibility introduces severe trust challenges, as traditional security countermeasures fail to scale or adapt in these decentralized, post-fabrication programmable environments. This paper presents INTERPUF, a compact, scalable authentication framework that transforms the interposer into a distributed root of trust. At its core, INTERPUF embeds a route based differential delay Physical Unclonable Function (PUF) across the reconfigurable interconnect and secures its evaluation using multi-party computation (MPC). The proposed architecture introduces only 0.23% area and 0.072% power overhead across diverse chiplets while preserving authentication latency within tens of nanoseconds. Simulation results using PyPUF confirm strong uniqueness, reliability, and modeling resistance, even under process, voltage, and temperature variations. By fusing hardware-based PUF primitives with cryptographic hashing and collaborative verification, INTERPUF enforces a minimal-trust model without relying on any centralized anchor.

Index Terms — Secure Heterogeneous Integration, Physically Unclonable Function.

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