6. 使用者, 群組, 與系統安全

6.1. DES, MD5, 以及 Crypt

6.2. S/Key

6.2.1. Secure connection initialization

6.2.2. Insecure connection initialization

6.2.3. Diversion: a login prompt

6.2.4. Generating a single one-time password

6.2.5. Generating multiple one-time passwords

6.2.6. Restricting use of UNIX passwords

6.3. Kerberos

6.3.1. 建立初始資料庫

6.3.2. 讓 Kerberos 動起來

6.3.3. 產生 server file

6.3.4. 填充資料庫

6.3.5. 完整的測試

6.3.6. 增添 su 權限

6.3.7. 使用其他指令

6.4. Firewalls

6.4.1. What is a firewall?

6.4.2. What does IPFW allow me to do?

6.4.3. Enabling IPFW on FreeBSD

6.4.4. Configuring IPFW

6.4.5. Example commands for ipfw

6.4.6. Building a packet filtering firewall