本文介绍了如何通过调整BIOS密码、GRUB密码以及内核检查等措施来增强系统的安全性，并提出了减少图形界面使用、禁用特定快捷键重启功能以及降低TTY数量等实用建议。
Boot security
=========================================
BIOS
pwd
GRUB
pwd
KERNEL
check the dmesg file
cpu,mem,hardware,kernel version
INIT
1, default run-level to 3 from 5
a. no graphical tcp x windows listeners
b. uses fewer system resources
2, Disabled Ctrl,alt,del -reboot
3, Reduce the number of TTYS
Shell security
======================================
=========================================
BIOS
pwd
GRUB
pwd
KERNEL
check the dmesg file
cpu,mem,hardware,kernel version
INIT
1, default run-level to 3 from 5
a. no graphical tcp x windows listeners
b. uses fewer system resources
2, Disabled Ctrl,alt,del -reboot
3, Reduce the number of TTYS
Shell security
======================================
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