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)


Gaëtan Leurent (#313)
Name Gaëtan Leurent
Personal Homepage
Topic of his/her doctorate. Design and Analysis of Hash Functions
Category secret-key cryptography
Keywords hash functions, cryptanalysis, SHA-3
Ph.D. Supervisor(s) David Pointcheval, Pierre-Alain Fouque
Year of completion 2010
Abstract Hash functions are essential primitives in modern cryptography, used in many protocols and standards.
My work has been organized around the SHA-3 competition, launched by NIST to select a new hash function standard. In the first part, I studied the new attacks of Wang et al. against MD4 and MD5. I describe some improvements of these attacks, and new applications to higher-level constructions. In the second part, I describe a new hash function, SIMD, which has been submitted to NIST for the SHA-3 competition. The design of SIMD follows ideas from the MD4 family, but I used my knowledge of this family to make it resistant to most attacks. Finally, in the third part, I describe new attacks against SHA-3 candidates. I give new attacks techniques which are general enough to apply to several hash functions or block ciphers. Thus, this thesis covers the two main realms of symmetric cryptography: design and analysis.
E-Mail Address gaetan.leurent (at)
Last Change 2011-04-11 08:58:30
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