Abstract: Because Word electronic document lacks protection of integrity, and current electronic seal system by taking digital watermark technology has security flaws, a new protection scheme for electronic seal system based on ECC（Elliptic Curve Cryptography） digital signature is presented. Meanwhile, the scheme creates a middleware based on MS Word re-development interfaces and control technology. The experimental results show that the proposed scheme is secure and has good performance.

Key words: electronic seal, integrity, Elliptic Curve Cryptography（ECC）, ActiveX control

摘要： 针对现有Word（.doc）电子文档缺乏完整性保护，以及现有电子文档签章软件采用数字水印嵌入印章图片的方法存在安全缺陷的情况，提出了一种基于椭圆曲线数字签名算法的电子签章系统方案；在Word二次开发接口上，利用控件技术创建Word编辑器中间件，实现对电子文档进行数字签名及认证的完整性保护。对比分析与实验表明，该方案具有较高的安全性，且在高效性和易操作性方面优于现有签章系统。

关键词: 电子签章, 完整性, 椭圆曲线密码学（ECC）, ActiveX控件