How to understand grub password

The grub password is divided into: full zone password (you need to enter the grub global password to modify the grub label after setting) and menu password (you need to enter the grub menu password to boot the system after setting)

If you forget the grub global password, you can enter Rescue mode (rescue, similar to winPE), reset grub password

In addition to plain text, grub password can also use encrypted cipher text.

grub encryption tools include: grub-md5-crypt and grub-crypt

grub-md5-crypt: MD5 encrypted password output

grub-crypt : If possible, select the encryption method --md5, --sha-256, --sha-512 (default)

Edit the file /boot/grub/grub.conf

Settings The GRUB global password format is as follows:

hiddemenu

password=plain text password or password --md5 MD5 cipher text or password --encrypted sha cipher text

Set GRUB The menu password format is as follows:

title

password=plain text password or password --md5 MD5 cipher text or password --encrypted sha cipher text

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