Abstract: The multivariate public key cryptosystem (MPKC), which is based the problem of solving a set of multivariate systems of quadratic equations over a finite field, is expected to be more efficient than RSA and ECC, and to be secure against quantum attacks. Although there are several existing schemes in MPKC that survived known attacks and are much faster than RSA and ECC, there have been few discussions on security against physical attacks, aside from the work of Okeya et al.(2005) on side-channel attacks on Sflash. In this study, we describe general fault attacks on MPKCs including Big Field type and Stepwise Triangular System type. |