目前电力系统中普遍采用 MIS实现办公自动化 ,完成文档的生成、确认、签发、传递、存档等工作。当前的 MIS都是采用简单的用户名 /口令机制实现对用户的身份认证 ,不能提供实质上的安全签名服务。采用基于公钥密码算法的数字签名可以充当个人在网络空间“身份证”的角色 ,能够很好地解决目前 MIS存在的敏感文档签名问题。文中介绍了密码算法的基本原理 ,给出了数字签名的解决方案。 At present, MIS is commonly used in power system to realize office automation and accomplish the tasks of generating, confirming, issuing, delivering and archiving documents. The current MIS are using a simple user name / password mechanism to achieve the user’s identity authentication, can not provide a real security signature service. The use of digital signature based on public key cryptography can act as an individual “ID card” in cyberspace and can well solve the problem of sensitive document signatures existing in MIS. In this paper, the basic principle of cryptographic algorithm is introduced, and the solution of digital signature is given.