International Association for Cryptologic Research

Ph.D. Database

The aim of the IACR Ph.D. database is twofold. On the first hand, we want to offer an overview of Ph.D. already completed in the domain of cryptology. Where possible, this should also include a subject classification, an abstract, and access to the full text. On the second hand, it deals with Ph.D. subjects currently under investigation. This way, we provide a timely map of contemporary research in cryptology. All entries or changes need to be approved by an editor. You can contact them via phds (at)


Christophe Giraud (#786)
Name Christophe Giraud
Topic of his/her doctorate. Attacks on embedded cryptosystems and corresponding countermeasures
Category implementation
Ph.D. Supervisor(s) Louis Goubin
Year of completion 2007
Abstract Side channel attacks are a very powerful tool used to recover secrets stored in embedded devices such as smart cards. By analysing the power consumption, the electromagnetic radiations or by disturbing the device, an attacker can easily obtain secret keys used by non protected embedded cryptosystems. The subject of this thesis is to extend the impact of side channel analysis by presenting new attacks and new countermeasures. The latter must have a very small impact on the performance of the algorithm since the embedded environment is limited in terms of both memory space and computation power. Firstly, we focus on Power Analysis countermeasures. We describe a method to protect the elliptic curve scalar multiplication from Simple Analysis. Then, we propose a countermeasure against Di?erential Analysis on DES and AES and a generic method to protect S-Box access. Secondly, we deal with Fault Attacks. After presenting a general overview of this ?eld, we propose new fault attacks on cryptosystems such as AES and XTR which haven’t yet been successfully impacted. Then, we improve some existing attacks on several signature schemes in order to be able to put these attacks into practice. Finally, we present new countermeasures on XTR and on the RSA cryptosystem.
E-Mail Address chris.giraud (at)
Last Change 2012-05-09 03:58:40
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