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)


Özgül Küçük (#777)
Name Özgül Küçük
Topic of his/her doctorate. Design and Analysis of Cryptographic Hash Functions
Category secret-key cryptography
Keywords hash functions
Ph.D. Supervisor(s) Bart Preneel, Vincent Rijmen
Year of completion 2012
Abstract The topic of this thesis is the design and analysis of cryptographic hash functions. A hash function is a map from variable-length input bit strings to fixed-length output bit strings. Despite their simple definition, hash functions play an essential role in a wide area of applications such as digital signature algorithms, message authentication codes, password verification, and key derivation. The main contribution of this thesis is a novel and elegant proposal of a cryptographic hash function. In this thesis, we approach the problem of the design and analysis of cryptographic hash functions with a particular example, the hash function Hamsi. The design of Hamsi is based on the use of a relatively light underlying primitive in each iteration of the mode of operation, combined with a strong message expansion function. We investigate the design constraints of this approach by analyzing Hamsi. In the first part, we cover the design aspects of Hamsi and also propose a variant called Hamsi$^\oplus$. In the sequent parts we provide analysis results, namely indifferentiability analysis and collision analysis. Finally, as a separate research study we analyze the initialization of the stream cipher Grain.
Your Ph.D. thesis as fulltext 93_zglKk_DesignndAnalysisCryptographicH.pdf
E-Mail Address ozgul.kucuk (at)
Last Change 2012-05-04 08:23:09
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