The first time I did that, there was a box I could check to use an LVM. And the next screen had a box to check for encrypting that LVM. That was back with opensuse 11.4 (if I remember correctly). I think similar options are available.
Since then I have preferred to have more control. So I create the LVM in advance.
For what you want, I suggest:
/dev/sda1: Use that as “/boot”. Make it 500M in size.
/dev/sda2: The rest of the disk goes here. This will become the LVM.
To actually create the LVM, I recommend using Yast. Boot live media (such as the 13.1 live rescue CD), and then run Yast Partitioner.
If you have not already done so, then first create “/dev/sda1” at 500M, and “/dev/sda2” as the remainder of the disk.
For “/dev/sda2”, click the box to encrypt the file system. You should be prompted for a key. Make sure that you remember the key that you provide. Also, use only ASCII characters (can include spaces) for the key.
Then click on Volume Management.
In volume management, the first thing you will need to do is create an LVM. Unfortunately, I don’t see the screen for an empty disk, because I already have an LVM. You have to give the volume a name, and then add “/dev/sda2” to that LVM.
Once that is done, you use the “Add” button to add volumes (carve the LVM space into volumes). You will need swap, root and home (suggested names for the volumes).
You did not tell us the size of your disk or how much memory. For the “swap” volume set the volume size to maybe 4G, or to the size of your memory. Set it to be formatted as swap, but not mounted. For “root” volume, I suggest 40G as size, assuming that you have plenty of space on the disk. For a small disk, try 20G or even 10G. If you use less than 40G, then format as “ext4” but set to not mount. If you have a large enough disk you might want to try “btrfs”. But, in that case, perhaps you should leave the root volume unformatted (to be formatted during install). And if the disk is large enough, maybe 60G might be a better size for the root volume if you plan to use “btrfs”.
Put all of the remaining space into the “home” volume.
Click the “Finish” button, and Yast partitioner should complete the job.
When you are ready to install, the installer will propose partitioning. It will propose to destroy what you have just setup. So select the option “create partitioning”, followed by the option to use “expert partitioning” (or maybe that says “custom partitioning”).
Before you get that far in install, you should have been prompted for the encryption key. Enter that when requested.
At the custom partitioning screen, you should see a list of partitions and LVM volumes.
Right click on the LVM volume for root, and select “Edit”. Set that volume to be mounted as “/” and to be formatted.
Right click on the LVM volume for “swap” and select “Edit”. It may already be set to be mounted as swap, in which case you can click “finish” without doing anything to swap.
Right click on the LVM volume for “home”. It was probably already formatted when you setup the LVM. You need to set it to mount to “/home”.
Right click on the line for “/dev/sda1”, and set it to be formatted and mounted as “/boot”. I usually recommend “ext2” for “/boot”.
Inspect everything, to make sure you have it right. Then accept the resulting partitioning setup. Then continue with install.
Okay, that looks a bit complex. Up until the final stage of install, you can click “Cancel” or “Abort”. That gets you out with nothing changed on the disk. So you can afford to make a few trial runs if you want.
It will seem a lot easier in future, when you already have experience with this.
I hope that helps.