The University of Southampton
University of Southampton Institutional Repository

Path switching: a technique to tolerate dual rail routing imbalances

Baddam, Karthik and Zwolinski, Mark (2008) Path switching: a technique to tolerate dual rail routing imbalances Design Automation for Embedded Systems

Record type: Article


Dual Rail Precharge (DRP) circuits, which are theoretically secure against differential power analysis attacks, suffer from an implementation problem: balancing the routing capacitance of differential signals. To solve this, four proposals have been put forward: Divided Wave Dynamic Differential Logic (DWDDL) (Tiri and Verbauwhede in DATE ’04, pp. 246–251, [2004]), FatWire (Tiri and Verbauwhede in Cardis 2004, pp. 143–158, [2004]), Backend Duplication (Guilley et al. in Lecture Notes in Computer Science, vol. 3659, pp. 383–397, [2005]) and Three Phase Dual Rail (Bucci et al. in Lecture Notes in Computer Science, vol. 4249, pp. 232–241, [2006]). Of these, three (DWDDL, FatWire, Backend Duplication) proposals alter the routing mechanism of Standard Place and Route tools, which in turn introduces an additional step. The other proposal introduces a third phase which reduces the system’s performance. In this paper we propose a new countermeasure, Path Switching, to address the routing problem in DRP circuits. From SPICE simulations we show that our proposal does not reveal the secret key for up to 300,000 traces, an increase of 75 times over normal Dual Rail circuits and 3000 times over normal single rail circuits.

PDF fulltext.pdf - Version of Record
Restricted to Registered users only
Download (870kB)

More information

Published date: May 2008
Keywords: DPA - Smart card security - Dual rail circuit - Path switching
Organisations: EEE


Local EPrints ID: 266478
PURE UUID: ade76ab8-90f7-4f55-b546-b1caba1359ab
ORCID for Mark Zwolinski: ORCID iD

Catalogue record

Date deposited: 01 Aug 2008 12:06
Last modified: 18 Jul 2017 07:16

Export record


Author: Karthik Baddam
Author: Mark Zwolinski ORCID iD

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton:

ePrints Soton supports OAI 2.0 with a base URL of

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.