基于背包和椭圆曲线的代理数字签名方案。结合椭圆曲线数字签名方案和变形的背包问题，提出了一种改进的椭国曲线数字签名 方案.-Backpack and the elliptic curve based on the proxy digital signature scheme. Combination of elliptic curve digital signature scheme and deformation of the knapsack problem, put forward an