VirtualBox has gone brutal – they have added an encryption option which will allow you to encrypt your virtual disks with the Disk Image Encryption option.
Oracle stated the following about the Virtual Disk Image Encryption option in VirtualBox:
Oracle VM VirtualBox 5.0 allows for encrypted virtual disk images by leveraging AES algorithm in XTS mode (128-bit or 256-bit); since the DEK is stored as part of the virtual machine configuration file, encryption introduces a further security feature that will ask for a password while starting the virtual machine.
