1年前学delphi后写的传奇极品脱机外挂的本地服务端，这个是多层认证的一个例子。-a delphi study years ago after writing off-line pylon Acura Legend of the local server, This is a multi-level certification is a case in point.

银联行PBOC脱机与联机认证流程，PBOC开发参考。(UnionPay line PBOC offline and online authentication process, PBOC development reference.)