(3) C TGS : IDC ||IDv || Tickettgs (4) TGS C: Ticketv
Ticket v = EKv [ IDC|| ADC || IDV|| TS2||Lifetime2] Visiting Service
(5)
(Once for each dialog)
(5)C V : IDc || Ticketv
Public Key Infrastructure
❖ In this Infrastructure, the claimer needs to prove his identity by providing the encryption key. This could be realized by sign a message with his encryption key. The message could include a duplicate value to defend the replay attacks.
▪ 作为提供数据源认证的一种可能方法(当与数据完 整性机制结合起来使用时)
▪ 作为对责任原则的一种直接支持,如审计追踪中提 供与某活动相联系的确知身份
概述-身份认证基本途径
❖基于你所知道的(What you know )
▪ 知识、口令、密码
❖基于你所拥有的(What you have )
▪ 身份证、信用卡、钥匙、智能卡、令牌等
❖ 问题一:票据许可票据tickettgs的生存期
▪ 如果太大,则容易造成重放攻击 ▪ 如果太短,则用户总是要输入口令
❖问题二:
▪ 如何向用户认证服务器
❖解决方法
▪ 增加一个会话密钥(Session Key)