RESOURCE-EFFICIENT CRYPTOGRAPHY FOR UBIQUITOUS COMPUTING Lightweight Cryptographic Primitives from a Hardware & Software Perspective DISSERTATION for the degree of Doktor-Ingenieur of the Faculty of Electrical Engineering and Information Technology at the Ruhr University Bochum, Germany by Elif Bilge Kavun Bochum, December 2014 Copyright © 2014 by Elif Bilge Kavun. All rights reserved. Printed in Germany. Anneme ve babama... Elif Bilge Kavun Place of birth: Izmir,˙ Turkey Author’s contact information:
[email protected] www.emsec.rub.de/chair/ staff/elif bilge kavun Thesis Advisor: Prof. Dr.-Ing. Christof Paar Ruhr-Universit¨atBochum, Germany Secondary Referee: Prof. Christian Rechberger Danmarks Tekniske Universitet, Denmark Thesis submitted: December 19, 2014 Thesis defense: February 6, 2015 v Abstract Technological advancements in the semiconductor industry over the last few decades made the mass production of very small-scale computing devices possible. Thanks to the compactness and mobility of these devices, they can be deployed “pervasively”, in other words, everywhere and anywhere – such as in smart homes, logistics, e-commerce, and medical technology. Em- bedding the small-scale devices into everyday objects pervasively also indicates the realization of the foreseen “ubiquitous computing” concept. However, ubiquitous computing and the mass deployment of the pervasive devices in turn brought some concerns – especially, security and privacy. Many people criticize the security and privacy management in the ubiquitous context. It is even believed that an inadequate level of security may be the greatest barrier to the long-term success of ubiquitous computing. For ubiquitous computing, the adversary model and the se- curity level is not the same as in traditional applications due to limited resources in pervasive devices – area, power, and energy are actually harsh constraints for such devices.