protect the communication against side-channel and scan-based attacks (e.g. SAT attack). Furthermore, we demonstrate that by properly configuring the value of $T$, *ExTru* not only increases the strength of security from per “*device*” to per “*message*”, it also significantly improves energy consumption as well as throughput in comparison with an architecture that only uses a conventional side-channel resistant block/stream cipher.'
author:
- Hadi Mardani Kamali
- Kimia Zamiri Azar
- |
    \
    Shervin Roshanisefat
- Ashkan Vakil
- Avesta Sasan
bibliography:
- 's-bibliography.bib'
nocite:
- '[@azar2019smt]'
- '[@roshanisefat2018srclock]'
- '[@kamali2018lut]'
title: '*ExTru*: A Lightweight, Fast, and Secure *Ex*pirable *Tru*st for the Internet of Things'
---

Introduction
============

The Internet of Things (IoT), which has been foreseen to become the most successful business for the next decade by *International Technology Roadmap for Semiconductors* (ITRS), is an inevitable landmark of smart life providing novel applications and services, ranging from business automation to personal day-to-day life [@gubbi2013internet; @al2015internet; @li2015internet]. The IoT infrastructure is the seamless connection of billions of heterogeneous devices (*“things”*) within a large integrated network (the *“Internet”*). The heterogeneity of IoT constitutes from a wide variety of devices, such as smartwatches, mobile phones, etc, which results in a drastic increase in 