Manually setting partitions with encryption?

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http://askubuntu.com – I just bought a new laptop and would like to installed Ubuntu 12.10, but I don't want to remove the recovery partitions that the manufacturer has setup (maybe that would void my warranty?). Looking at the manual partition setup, I understand that my root partition needs to be unencrypted, while my /home and swap need to be encrypted. Two questions: --How big does my root partition need to be? --How do I encrypt the swap? There only appears to be one 'swap' option in the drop-down box. (HowTos)