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In Sakumoto et al. (CRYPTO 2011, LNCS, vol 6841. Springer, Berlin, pp 706–723, 2011), presented a new multivariate identification scheme, whose security is based solely on the MQ-Problem of solving systems of quadratic equations over finite fields. In this paper we extend this scheme to a threshold ring identification and signature scheme. Our scheme is the first multivariate scheme of this type and...
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