In this paper, the method for feature extraction and selection of handwriting signature is discussed. On this basis, a functional algorithm of special points extraction has been presented.

介绍了手写签名特征抽取和选择的一般方法，并在此基础上，提出了一种实用的签名笔迹特殊点提取算法。

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This paper represents an improved method of digital signature, which is based on the principle of combined public key(CPK) and combined with the algorithm of elliptic curve cryptosystem(ECC).

利用组合公钥体制（CPK）的基本思想，结合椭圆曲线加密（ECC）算法，提出了一种改进的数字签名方案。

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