Separately encrypt dual-boot system: Windows+Arch

Hey guys, I want to use a dual-boot system: Windows 7 + Arch (windows being first on hdd). I would also want to encrypt them, but make it so I could access them with different passwords, like if I enter arch, i woudn't be able to see contents of windows, and vice-versa. I need arch to be on LVM, ext4 filesystem(the latter not so important, if it's trouble).
I've come accross this guide: https://aprescott.com/posts/dual-bootin … encryption which describes windows 7 encrypted with truecrypt + arch(on lvm) encrypted with dm-crypt+luks, grub legacy is put inside MBR, truecrypt bootloader resides on linux /boot, copied from MBR after truecrypt installed it there and then replaced with GRUB. With described approach there is windows boot partition and linux boot partition which remain unencrypted.
1) The question is, is it possible to do something similar but make those boot partitions encrypted too? so the only thing unencrypted would be MBR? I've read that people used Disc cryptor and with it easily encrypted windows boot partition with no trouble. What about linux boot partition? Maybe there is a way not to make separate /boot for linux, and encrypt the whole lvm partition with truecrypt(so truecrypt would install it's bootloader into MBR and i could save it and use just like in the link i gave above)?
2)Another question is for people using truecrypt for whole disk encryption. When you do full disk encryption or system encryption(for example Windows), the only thing left unencrypted is MBR? Is the boot sector of windows partition encrypted too? So in this case it maybe possible to keep MBR(at least the bootloader, without partition table) on separate media.
3)Also, in case of full disk encryption, is partition table encrypted too?
and please, I don't want questions as "Why do you need it this way?". I just want to have full disk encryption, so if the MBR is the only thing unencrypted I could keep it on separate media and boot from it(Disc Cryptor allows such feature), but I also need the system to be split into windows and linux parts, accessible by different passwords. And I dont think the idea of using truecrypt hidden partition and hidden os is good in here.
Thanks in advance.
Last edited by Kape (2013-01-24 13:58:41)

hiciu wrote:
/dev/sda
+--------------------------------------+
|(mbr and partition table) |
| +----------------------------------+ |
| |(truecrypt) windows boot partition| |
| |----------------------------------| |
| |(truecrypt) windows 7 | |
| |----------------------------------| |
| |linux boot partition | |
| |----------------------------------| |
| |(lvm on luks) | |
| | +------------------------------+ | |
| | |rootfs | | |
| | |------------------------------| | |
| | |home | | |
| | |------------------------------| | |
| | |swap | | |
| | +------------------------------+ | |
| +----------------------------------+ |
+--------------------------------------+
3)Also, in case of full disk encryption, is partition table encrypted too?
Take a look at diagram #1 . Mbr and partition table will be not encrypted. You don't want that: there are no sensitive data in there; both windows and linux need to access partition table to know where are partitions on disk; mbr must contain some not encrypted code that will be loaded by bios, since that code can't be encrypted it can be modified (potentially in such a way to hide the modifications from the system), as long as you boot from this device there is no way around it without "secure boot" and mbr singing.
I believe windows boot partition and windows partition can be encrypted with truecrypt (you need to check that, I don't know truecrypt). There still will be some minimal not encrypted bootloader in order to ask you for for key / passphrase, so it is not 100% secure (someone could replace it; search for "evil maid" attack by Joanna Rutkowska).
Linux bootloader (I forgot about it on diagram) and linux boot partition can't be encrypted (again, unless you do: truecrypt -> grub2 / syslinux -> linux, and there still will be not encrypted minimal bootloader).
You see, the problem is always the same: you can't boot from encrypted device. You need something that will decrypt it first.
I just want to have full disk encryption, so if the MBR is the only thing unencrypted I could keep it on separate media and boot from it(Disc Cryptor allows such feature), but I also need the system to be split into windows and linux parts, accessible by different passwords.
In order to secure boot partitions / bootloaders one could separate encryption and bootloaders, keep data on encrypted disk and keep bootloaders code at secure location (i.e. on pen drive attached to key chain). Take a look at diagram #2:
/dev/sda /dev/usb-stick
+--------------------------------------+ +--------------------------+
|(mbr and partitions table) | |(mbr and partitions table)|
| +----------------------------------+ | | +----------------------+ |
| |other data / partitions | | | |linux boot partition | |
| +----------------------------------+ | | | +------------------+ | |
| |(lvm on luks) | | | | |grub / syslinux | | |
| | +------------------------------+ | | | | |kernel | | |
| | |rootfs | | | | | |initramfs | | |
| | |------------------------------| | | | | +------------------+ | |
| | |home | | | | +----------------------+ |
| | |------------------------------| | | +--------------------------+
| | |swap | | |
| | +------------------------------+ | |
| +----------------------------------+ |
+--------------------------------------+
In this setup you boot your system from usb stick. Bios will load and execute mbr and bootloader from usb stick (and you know its good since you have it physically secured), it should decrypt luks and boot system. You still can run windows with truecrypt using /dev/sda as boot device. I know I didn't exactly answered your questions.
1)so this way i can leave mbr(including partition table) empty on hdd, while having them on usb stick? good. I can put copy of mbr with truecrypt loader on that usb stick too along with /boot partition just like in the link i gave above? So there would be NOTHING left unencrypted on my hdd? i like it.
2)My main goal is that hdd would look like blank if someone would want to check its contents. I've heard using Luks leaves some traces in the volume header?(it's not possible to use truecrypt for full linux system encryption too, right?)
3)How do i properly put /boot on usb stick? Also will there be any troubles updating arch with /boot being on separate media?
thanks!

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Lightning is a problem for you because it hooks into Thunderbird at a low level and you need a version compiled for the platform Thunderbird is running on. So you can't do the preferred solution, which is to put your whole profile in a shared folder and have both instances of Thunderbird reference the same profile. (Ditto for Enigmail). Lightning may become an integral part of Thunderbird in an upcoming release, at which point this limitation due to Lightning should disappear.
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My system specs are:
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Thanks for the responses. Perhaps more of an explanation as to what I have done is in order.
I purchased this Dell XPS 600 XP Pro system some time ago. It was a "boomer" (powerful) system in its' day.
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On my system. Wrong. It (the Windows XP My Computer Properties system would not see over 2 gb (even though BIOS said there was 3gb!) Additionally, BIOS said my board was capable of 64 bit processing.
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I did, and Vista 64 does see the current 3gb in the system. I should add, I am going to make it an 8gb system and my memory will arrive from crucial.com tomorrow.
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And as always, thanks
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Strange. I don't have a clue, but I have seen posts here that recoverd from strangeness after a BIOS update by unplugging from the AC mains, removing the battery, and then pressing the power button several times. The last time, hold the button for 10 seconds or so.
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Out of curiousity, what do you see when grub finally loads. I take it that it isn't your original boot menu. Do you have grub installed in the MBR, the boot sector of the Linux partition, or both? Is the Linux partition (or Linux boot partition if you have boot + root) the 1st one on the drive, or _after_ the vista partition.
[edit] You didn't ask, but IMNSHO multibooting a modern laptop isn't really the easiest way to run multiple OSs. I run Linux, Solaris, and OS X in VMs under Win 7 on my T400. They run well, and that approach avoids issues like you are having. The Lenovo ThinkVantage boot-time stuff and R&R are rather fragile. Changes in partitioning and MBR configuration can break them. BIOS and other updates, and Windows repairs can break the multi-boot setup.
There are several ways to set up VMs, but VMWare Player is what I use. The latest version is free and quite usable.
Z.
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Creating a dual boot HD Windows 7 32 and Windows 7 64 bit OS

I have a 750 GB HD with one bootable partition of Windows 7 32 bit OS using 320 GB space. Was cloned from a HD that was physically 320 GB. Still have 400 GB unallocated space on the HD. HD is currently in a ultrabay and I can boot from either the internal 320 GB HD or the 320 GB partition on the 750 GB HD. Can put the Ultrabay in either a T61 or T61P laptop. Have the 64 bit install DVD for Windows 7 and would like to install it on the unpartitioned space on my 750 GB HD using some or all of the 400 GB unpartitioned space. How do I create the dual boot system on the Ultrabay 750 GB harddrive?

All you have to do is install the windows, it will install a boot manager so you can select among the operating systems.
Also understand that the drive installed in your ultrabay will run slower, so you're best to use the boot drives as your primary drive and use an ultrabay drive only for storage.
ThinkPad W-510 i7-820QM(1.73-3.06GHz) Quad Core... ThinkPad T500, T9900, 8gb SSD...FrankNpad T-60p/61p (X9000 2.8ghz) 8gb SSD ips FlexView...ThinkPad T-61p (T9300 2.5ghz) 8gb ram...Thinkpad X-61 Tablet 4gb ram...ThinkPad A-31 (1.9ghz P4 1.5gb ram)

I have a macbook and it is a dual boot system, I would like to be able to see the mac side of the system on a larger monitor. I can hook to a hdmi cable and see the pc side, but not the mac side, any suggestions?

I have a macbook that I bought second hand. The mac has a dual boot system with bootcamp on one side and snow leopard on the other. I would like to be able to hook to a larger hdmi monitor so that in both systems I could see better since on the leopard side the computer has PS4. I have purchased the dvi to HDMI accessory and purchased the HDMI to DVI cable, and can see fine on the bootcamp side, but nothing on the leopard side. Could somebody help me with configuring things so that it will see both side?
Also on a minor note, I need to purchase a new battery for this item and don't know which one to purchase. Any help would be greatly appreciated, especially with the display/monitor issue.
Thanks Sue
ps sorry but the operating system is OS X

When you try to use the Mac side on your external monitor do you get a blank screen or do you see the aurora background?
It would help to know which one of the 9 different models of MacBook you have. To see which model you have go to the Apple in the upper left corner and select About This Mac, then click on More Info. When System Profiler comes up check the Model Identifier and post it back here.

Separately encrypt dual-boot system: Windows+Arch

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