cryptsetup
Disk Encryption

A convenience and ease-of-use layer for use on top of dm-crypt.

Security Notes

Gentoo maintains a guide for dm-crypt with LUKS.

Arch Linux also maintains a guide to dm-crypt with LUKS.

Slackware Linux also maintains a guide to dm-crypt with LUKS.

dm-crypt is available for DragonFly BSD.