對前向安全簽名體制進行了研究，提出了一種新的前向安全的簽名算法。該算法能同
時滿足簽名密鑰的更新與簽名的前向安全，具備了更高的前向安全性.從而最大限度的減少了私鑰泄漏所造成的危害。把該算法應用到交叉認證及電子商務等網上辦公系統方面，不但可以提供更高的安全性，而且可以大大地提高辦公系統的效率。
關鍵詞 前向安全；交叉認證；電子商務

Research and Applications of Signature Cryptosystem based on the Forward-secure Digital Signature YUN Cui-lan1 CHENG Guo-sheng 1 LIU Yuan-hua 2 (1: Nanjing University of Information Science & Technology, Nanjing, 210044, china; 2: Xidian University, Xi’an, 710071, china) Abstract: A new forward-secure digital signature is proposed by researching on the forward-secure signature cryptosystem. It ensures that both the update of the signature’s secret key and the signature are secure, which has higher forward-secure. Thereby, the loss caused by leaking key is reduced to the minimum degree. Moreover, this algorithm is applied to the web office system such as cross authentication 、 E-commerce and so on. It not only can offer higher security but also largely improve the efficiency of the office system.
Key words: forward-secure; cross authentication；E-commerce