====== Linux passwords ======

Passwords are found in ''/etc/passwd'' or ''/etc/shadow''.

They can be generated with ''mkpasswd''.

Change your own password with ''passwd''.

===== Hashes =====

Generate yescrypt hash: ''mkpasswd -m yescrypt''

==== Versions ====
If you generate a password with ''mkpasswd'', there's a version ID enclosed in ''$'' at the beginning before the actual hash, e.g. the ''$6$'' in ''__**$6$**__9isv4eTgG8dkgV8i$mJiRv8W/wsINlwikTXoJWSyyr8yH8tBbg9nu0cOXNGquQrT0SXEDvrzLjiq33tR0M1moKPsiKk67dqVphwOH7/''

^ Version string ^ algorithm |
| ''$5$'' | sha256crypt |
| ''$6$'' | sha512crypt |
| ''$7$'' | scrypt |
| ''$y$'' | yescrypt |
| ''$gy$'' | gost-yescrypt |

You shouldn't use older versions than 5. Especially passwords with MD5 (''$1$'') or DES hashes (no version string) have a very high collision probability and as such, are easy to crack.

For older systems (e.g. Debian before version 10), yescrypt **might** not be available, so you might have to downgrade to sha512crypt or even sha256crypt.