Mastering Linux Security and Hardening

Encrypting the swap partition with eCryptfs

If you're just encrypting individual directories with eCryptfs instead of using LUKS whole-disk encryption, you'll need to encrypt your swap partition in order to prevent accidental data leakage. Fixing that problem requires just one simple command:

donnie@ubuntu:~$ sudo ecryptfs-setup-swap[sudo] password for donnie:WARNING:An encrypted swap is required to help ensure that encrypted files are not leaked to disk in an unencrypted format.HOWEVER, THE SWAP ENCRYPTION CONFIGURATION PRODUCED BY THIS PROGRAM WILL BREAK HIBERNATE/RESUME ON THIS SYSTEM!NOTE: Your suspend/resume capabilities will not be affected.Do you want to proceed with encrypting your swap? [y/N]: yINFO: Setting up swap: [/dev/sda5] ...