PKI 技術已日臻成熟并在許多方面得到應用，但是PKI 中也還存在著很多問題有待解
決。本文介紹了PKI 技術的發展及應用，并就PKI 在產品兼容性、復雜性、CA 的信任危機、密鑰管理、證書驗證機制、證書撤消、X.509 存在問題、相關法律、法規的缺乏、用戶認識不足、個人隱私、賠付機制的缺失、成本等幾個方面存在的問題，進行了分析。
關鍵字:PKI （Public Key Infratructure）,CA(Certifivate Authority),證書，網絡安
全
the development and question analysis of PKI ZHANG Qiu-yu, Liang Shuang, Wang Li_na (School of Computer and Communication, Lanzhou University of Technology, Lanzhou 730050)Abstract：PKI have grown up step by step and applied in a lot of fields, but there are a lot of questions to solve in PKI.This paper introduce development and application of PKI and analysis such questions as products compatibility、 complexity、trust crisis of CA、key management、 certificate validate、certificate revocation、questions of X.509、 scarcity of law、user’s impercipient、private、 scarcity of compensate and cost.
Keywords:PKI （Public Key Infratructure）,CA(Certifivate Authority),Certificate ,Network
Security