Abstract: With the rapid development of information technology, information office has become the trend of the development of all sectors of society. As an important foundation and carrier of e-government, e-government extranet plays an increasingly important role in improving government management and service capabilities, and its security has also attracted much attention. Through analyzing several common authentication methods in e-government extranet and e-government system, this paper concludes that the digital certificate authentication method based on block chain can effectively solve the problems of low efficiency and single point failure of traditional digital certificate authentication system. The research of this system is not only applicable to the e-government extranet, but also has certain reference significance to the establishment of trust system in the security management of industry private network and other network systems.

Key words: digital certificate, e-government extranet, block chain, identity authentication, security

摘要： 随着信息技术的飞速发展，信息化办公已经成为社会各行业发展的趋势，电子政务外网作为电子政务的重要基础和载体，在提高政府管理和服务能力方面发挥着越来越重要的作用，其安全性也备受关注．文章主要通过分析电子政务外网以及电子政务系统中常见的几种身份认证方式，得出基于区块链的数字证书认证方式，能够有效地解决传统数字证书认证体系效率低、单点失效等问题．本系统的研究不仅适用于电子政务外网，对行业专网和其他网络系统的安全管理中信任体系的建立也具有一定的借鉴意义．

关键词: 数字证书, 电子政务外网, 区块链, 身份认证, 安全性