目前,中国正大力发展税务信息化。随着税务部门逐步实现网上电子报税及纳税,公司信息和税务数据在网络上积累日益丰富,也使网络信息安全变得尤为重要。如何预防病毒感染和黑客入侵,防止他人恶意篡改盗取资料,已成为税务信息人员研究的核心问题。通过对中国税务信息化的现状描写,简要谈论PKI及PKI中的CA认证系统对保护信息安全所起的作用,以及在税务系统中的应用。 At present, China is vigorously developing tax informationization. With the gradual realization of online tax filing and tax payment by the tax authorities, corporate information and tax data have become more and more abundant over the Internet, making it even more important for the security of network information. How to prevent virus infection and hacking, to prevent malicious tampering with other people to steal information, has become the core issue of tax information officers. Through the description of the status quo of China’s taxation informationization, it briefly discusses the role of CA certification system in PKI and PKI in protecting information security and its application in the taxation system.