Setting up an encrypted swap partition on Debian.
Installation
Install cryptsetup:
# apt-get install cryptsetup
Configuration
Disable any existing swap areas:
# swapoff -a
Wipe the swap partition (we use 1GB /dev/sdb3):
# dd if=/dev/urandom of=/dev/sdb3 bs=10M
Add swap partition to /etc/crypttab:
# cat > /etc/crypttab << EOL swap /dev/sdb3 /dev/urandom swap EOL
Add to /etc/fstab:
# echo "/dev/mapper/swap none swap sw 0 0" >> /etc/fstab
Reload cryptdisks and enable all swap devices:
# /etc/init.d/cryptdisks reload # swapon -a
References
http://www.microhowto.info/howto/create_an_encrypted_swap_area.html