核心技术Ⅱ：安全

9.1 类加载器· · ··········· · ·············· ····· 401 9.1.1 类加载过程························402 9.1.2 类加载器的层次结构···········403 9. 1.3 将类加载器作为命名空间404 9.1.4 编写你自己的类加载器··· · · ···405 9 1 5 字节码校验．． ． ．．．． ． ．．．．．．．． 410 9.2 安全管理器与访间权限..…........ 414 9.2.1 权限检查········................. . .. 414 9.2.2 Java 平台安全性.................. 415 9.2.3 安全策略文件，.................... 418 9.2.4 定制权限··············.. ······ ······424 9.2.5 实现权限类···· · ······ · ············426 9.3 用户认证·································431 9.3.1 JAAS 框架.......... . ....... . ....... 431 9.3.2 JAAS 登录模块......... . ......... 437 9.4 数字签名.... . ............... . ............ 445 9.4.1 消息摘要······················ · · · ···445 9.4.2 消息签名，··················· · ·..···448 9.4.3 校验签名， ····· · ··· · ····· · ··· · ·······449 9.4.4 认证问题····· · ········· · ············ 4 52 9.4.5 证书签名·· · · ········ · ·········· · ··· · 454 9.4.6 证书请求....... . ................. . 454 9.4.7 代码签名........ . ........... . ....... 455 9.5 加密，....... . .............. . . .. . ........... 460 9.5.1 对称密码.. . . . ............. . . . ....... 461 9.5.2 密钥生成......... . ................ 462 9.5.3 密码流·· · ·······................ . .. . . 466 9.5.4 公共密钥密码，.......... …....... 467