Crystal Clough John Baena Jintai Ding Bo-Yin Yang Ming-Shing Chen Square, a New Multivariate Encryption Scheme. 252-264 2009 CT-RSA http://dx.doi.org/10.1007/978-3-642-00862-7_17 conf/ctrsa/2009 db/conf/ctrsa/ctrsa2009.html#CloughBDYC09