该协议中，用于给S服务和客户端通信提供会话密钥的是（2），用于各客户端和应用服务器端提供会话密钥的是（3）。
正确答案及解析
正确答案
解析
（2）AS服务器（3）TGS服务器
AS服务器在验证用户的身份之后，生成随机密钥用于客户端与TGS’之间的会话加密。TGS服务器在获得AS发过来的票据后，确认客户端与应用服务器之间的关系，生成随机密钥用于客户端与应用服务器之间的会话加密。
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