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)


Jian Guo (#346)
Name Jian Guo
Personal Homepage
Topic of his/her doctorate. Analysis of Cryptographic Hash Functions
Category secret-key cryptography
Keywords hash functions
Ph.D. Supervisor(s) Huaxiong Wang
Year of completion 2011
Abstract This thesis concentrates on analysis of cryptographic hash functions, one of the most important primitives used in the modern cryptography. We start with an introduction of the cryptographic hash functions, and a survey on the development of the cryptanalysis tools. To enrich the cryptanalysts’ toolbox, we developed several interesting techniques under the framework of differential cryptanalysis, and applied them to LAKE, BLAKE, ARIRANG and BMW to ?nd collisions. We also improved the meet-in-the-middle preimage attacks, one of the most powerful techniques for breaking one-wayness of many functions, and applied these techniques to SHA-2, Tiger, MD4, and HAVAL to ?nd preimages. All these techniques await for further development and applications to other hash functions including the candidates in current SHA-3 competition.
E-Mail Address ntu.guo (at)
Last Change 2015-01-30 13:18:41
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