Questions[encryption](ubuntu)

I installed Ubuntu 11.10 with the alternate CD and encrypted the whole system (except boot) with the encrypted LVM. Update 2020: Encrypted LVM can be selected at the Installation type step of the Ubuntu install, click on Advanced features and choose Use LVM and Encrypt ...

Everything works great as before, but I would like to change the password of the encrypted LVM. I tried to follow the Tips and Tricks of this article, but it does not work. After typing:

sudo cryptsetup luksDump /dev/sda5

It says: "Device /dev/sd5 doesn't exist or access denied." I thought the encrypted partition is /dev/sda5. Any help how to change the password?

Let's say that I have a folder, within my Documents folder, that has files I want no one to access without a password.

Is there a way to lock down that folder so that it's password protected / encrypted?

In fact, is it possible to password-protect any individual folder?

How do I create an encrypted (password protected) zip file?

I have a new Ubuntu 10.04 installation with encrypted home directory (using the built-in encryption offered by Ubuntu installer).

What's the easiest way to stop using encryption? (I.e., to decrypt my home directory permanently.)

(It's giving me problems with kernel updates, and I'd just like to cut down on all the hassle I'm having with this installation.)

• Does encrypting my home folder make my computer more secure?
• Do I have to enter my password more if my home folder is encrypted?
• What else should I know about encrypting my home folder?