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Stream cipher ZUC plays a crucial role in the next generation of mobile communication as it has already been included by the 3GPP LTE-Advanced, which is a candidate standard for the 4G network. Through a long-time evaluation program, ZUC algorithm is thought to be robust enough to resist many existing cryptanalyses, but not for DPA, one of the most powerful threat of SCAs (Side Channel Analysis).Up to the present, almost all the work on DPA is for block ciphers, such as DES and AES, a very few work has been done on stream ciphers, such as ZUC algorithm, for particular reasons that would be illustrated in the later section. In this paper, the authors generally study the security of unprotected ZUC hardware implementation against DPA.
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