Improvement on Multivariate Signature Scheme Model
Xinmei Wang · Beijing Youdian Xueyuan xuebao · 2009
Since most of the known multivariate public key signature schemes are under attacks,an improved signature model is proposed by analyzing the structure of the classical model.The method to redesign the model is to add another secret transformation so that the public key polynomials are not corresponding to the composition of the private keys,that is not the case in classical model,and the message value is hidden,then the amount of information obtained by attacker are reduced,and the scheme performance against attacks is enhanced.Analysis shows that the improved model can strengthen the security of various multivariate signature schemes.Finally,medium-field extension(MFE) multivariate cryptosystem is taken as an example to illustrate the idea.