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Public Key Cryptography – PKC 2008
In this paper, we describe efficient forgery and full-key recovery attacks on the -IC − signature scheme recently proposed at PKC 2007. This cryptosystem is a multivariate scheme based on a new internal quadratic primitive which avoids some drawbacks of previous multivariate schemes: the scheme is extremely fast since it requires one exponentiation in a finite field of medium size and the public key is shorter than in many multivariate signature schemes. Our attacks rely on the recentdoi:10.1007/978-3-540-78440-1_1 dblp:conf/pkc/FouqueMPS08 fatcat:4h2u6h62unfjhhvu7h7ycsp7yu