dmcrypt - open encrypted drive with key
From thelinuxwiki
configure you box to open the partition / disk using a key
example using gentoo
mybox home # vi /etc/conf.d/dmcrypt
added lines...
target=home source='/dev/sdb1' key='/root/hdpw'
- the following took a long time...
mybox home # dd if=/dev/random of=/root/hdpw bs=1 count=512 512+0 records in 512+0 records out 512 bytes (512 B) copied, 2821.2 s, 0.0 kB/s
mybox home # chmod 400 /root/hdpw
mybox home # cryptsetup luksAddKey /dev/sdb1 /root/hdpw Enter any passphrase:
All done, test with a reboot.