With the rapid development of the internet and electronic commerce , it is required that service division should be more and more specialized and fine - sorted . as a result , public - key infrastructure ( pki ) , which has both the function for the authentication and the function for the authorization , has become maladjusted in the present information technology society 隨著internet和全球電子商務(wù)的突飛猛進(jìn),對服務(wù)分工要求越來越細(xì)的同時,現(xiàn)有公鑰基礎(chǔ)設(shè)施pki框架中同時實現(xiàn)身份認(rèn)證和授權(quán)管理的功能模式,已越來越不適應(yīng)當(dāng)代信息社會的發(fā)展需求。