The aim of this article is to solve the system $XA=Y$ where $A=(a_{ ij})\in M_{ m\times n}(S)$, $Y\in S^{ m}$ and $X$ is an unknown vector of size $n$, being $S$ an additively idempotent semiring. If the system has solutions then we completely characterize its maximal one, and in the particular case where $S$ is a generalized tropical semiring a complete characterization of its solutions is provided as well as an explicit bound of the computational cost associated to its computation. Finally, when $S$ is finite, we give a cryptographic application by presenting an attack to the key exchange protocol proposed by Maze, Monico and Rosenthal.
Categories: cs.IT math.IT math.RA