【摘要】 由于目前的代理重签名方案几乎都是基于大数分解、离散对数和椭圆曲线等问题设计的,无法抵抗量子攻击,提出了一个新的代理重签名方案。该方案通过借助多项式同构和秘密仿射变换技术,能够高效地完成代理重签名功能并且可以抵抗量子攻击。通过分析表明,该方案不但满足正确性与一致性,并且在随机预言机模型下具有不可伪造性。与现有的代理重签名方案相比,该方案不仅继承了多变量公钥密码体制的高效性与抗量子攻击性,还具有复用性、透明性和秘密代理性等特点。更多还原

【Abstract】 Most of the existing proxy re-signature schemes were based on the hardness of big integer factoring,discrete logarithm,elliptic curve.However,none of them can resist the attack by a quantum computer.Motivated by these concerns,a new proxy re-signature scheme was proposed.By employing secret affine transformations and homogeneous polynomials,the proposed scheme could implement the signature transformation with high-efficiency,and meanwhile it was secure against the attack by a quantum computer.The results of analysis showed that the proposed scheme was correct and consistent,and had the unforgeability in the random oracle model.Compared with the existing schemes,the proposed scheme not only inherits the resistance to quantum attack and high efficiency from the multivariate public key cryptosystems,but also has the properties of multi-use,transparent and private proxy.更多还原