Welcome to the resource topic for 2015/114
Title:
Weak Ideal Functionalities for Designing Random Oracles with Applications to Fugue
Authors: Shai Halevi, William E. Hall, Charanjit S. Jutla, Arnab Roy
Abstract:We define ideal functionalities that are weaker than ideal functionalities traditionally used in realizing variable input length (VIL) random oracles (RO) in the indifferentiability or universal-Composability (UC) model. We also show realization of VIL-RO using these weaker ideal functionalities, with applications to proving Fugue and CubeHash hash functions to be VIL-RO. We argue that components of Fugue realize this weaker ideal functionality using techniques employed in proving resistance of Fugue to differential collision-attacks. This should be contrasted with other hash functions that are proven VIL-RO assuming the components are extremely ideal, e.g. random permutations.
ePrint: https://eprint.iacr.org/2015/114
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