Willi Geiselmann Willi Meier Rainer Steinwandt An attack on the isomorphisms of polynomials problem with one secret. 59-64 2003 2 Int. J. Inf. Sec. 1 http://dx.doi.org/10.1007/s10207-003-0025-5 db/journals/ijisec/ijisec2.html#GeiselmannMS03