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In this short note we report on invariant subspaces in Simpira in the case of four registers. In particular, we show that the whole input space (respectively output space) can be partitioned into inva...
Cryptanalysis of Yasuda, Takagi and Sakurai's Signature Scheme Using Invariant Subspaces
post-quantum cryptography multivariate public key cryptosystem invariant subspace
2015/12/22
In PQCrypto 2013 Yasuda, Takagi and Sakurai proposed an interesting signature scheme of efficiency $O(n^2)$ with parameter $(q=6781, n=121)$ claimed to have 140-bit security level. Later on almost at ...