When a Subscriber connects to the Publisher or Distributor and requests access to a publication, the authentication information passed by the agent is checked against the PAL.
The scheme realizes the incorporation of authentication and registration. Key distribution among mobile node, foreign agent and home agent is also achieved in the scheme.
该方案实现了认证和注册过程的一体化，并且实现了移动节点、外地代理和家乡代理三个实体间的密钥分配。
3
Authentication is the process of proving an association or identity between an agent (the end-user in our case) and a defined degree of trust.