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Lightweight AE and HASH in a Single Round Function
Authors: Dingfeng Ye, Danping Shi, Peng WangAbstract:
To deal with message streams, which is required by many symmetric cryptographic functionalities (MAC, AE, HASH), we propose a lightweight round function called Thin Sponge. We give a framework to construct all these functionalities (MAC, AE, and HASH) using the same Thin Sponge round function. Besides the common security assumptions behind traditional symmetric algorithms, the security of our schemes depends on the hardness of problems to find collisions of some states. We give a class of constructions of Thin Sponge, which is improvement of the round function of Trivium and ACORN. We give simple criteria for determining parameters. According to these criteria, we give an example, which achieves all functionalities in a single round function and hence can be realized by the same hardware. Our algorithm is also efficient in software.
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