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On Jun 2, 2014, at 17:52, "J. Roeleveld" <joost@××××××××.org> wrote: |
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> On Monday, June 02, 2014 03:23:03 PM Matti Nykyri wrote: |
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>> On Jun 2, 2014, at 16:40, "J. Roeleveld" <joost@××××××××.org> wrote: |
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>>> On Monday, June 02, 2014 07:28:53 AM Rich Freeman wrote: |
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>>>> On Mon, Jun 2, 2014 at 6:56 AM, Neil Bothwick <neil@××××××××××.uk> wrote: |
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>>>>> On Mon, 02 Jun 2014 05:27:44 -0500, Dale wrote: |
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>>>>>> The second option does sound what I am looking for. Basically, if I |
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>>>>>> log |
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>>>>>> out but leave my computer on, leave home, some crook/NSA type breaks in |
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>>>>>> and tries to access something or steals my whole puter, they would just |
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>>>>>> get garbage for data. That seems to fit the second option best. |
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>>>>> |
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>>>>> If they steal your computer they will have to power it off, unless you |
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>>>>> are kind enough to leave them a large enough UPS to steal along with it, |
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>>>>> so any encryption will be equally effective. |
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>>>> |
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>>>> If you're worried about casual thieves then just about any kind of |
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>>>> properly-implemented encryption will stop them. |
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>>>> |
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>>>> If you're worried about a government official specifically tasked with |
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>>>> retrieving your computer, my understanding is that it is SOP these |
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>>>> days to retrieve your computer without powering it off for just this |
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>>>> reason. They won't use your UPS to do it. Typically they remove the |
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>>>> plug just far enough to expose the prongs, slide in a connector that |
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>>>> connects it to a UPS, and then they pull it out the rest of the way |
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>>>> now powered by the UPS. |
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>>>> |
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>>>> See something like: |
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>>>> http://www.cru-inc.com/products/wiebetech/hotplug_field_kit/ |
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>>> |
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>>> Hmm... Those are nice, but can be easily built yourself with an |
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>>> off-the-shelf UPS. |
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>>> |
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>>>> Presumably somebody who is determined will also have the means to |
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>>>> retrieve the contents of RAM once they seize your computer. Besides |
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>>>> directlly accessing the memory bus I think most motherboards are not |
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>>>> designed to be secure against attacks from PCI/firewire/etc. |
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>>> |
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>>> Hmm... add something to auto-shutdown the computer when a hotplug event |
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>>> occurs on any of the internal ports and remove support for unused ports |
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>>> from the kernel. |
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>>> |
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>>> I wonder how they'd keep a computer from initiating a shutdown procedure |
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>>> or |
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>>> causing a kernel panic when it looses (wireless) connection to another |
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>>> device that is unlikely to be moved when powered up? |
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>> |
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>> Well i have a switch in the door of the server room. It opens when you open |
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>> the door. That signals the kernel to wipe all the encryption keys from |
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>> kernel memory. Without the keys there is no access to the disks. After that |
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>> another kernel is executed which wipes the memory of the old kernel. If you |
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>> just pull the plug memory will stay in its state for an unspecified time. |
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> |
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> You don't happen to have a howto on how to set that up? |
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Well i have a deamon running and a self made logic device in COM-port. Very simple. It has a single serial-parallel converter to do simple IO. Currently it just controls one relay that powers the network-devices. |
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>> Swap uses random keys. |
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>> |
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>> network switches and routers get power only after firewall-server is up and |
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>> running. |
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> |
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> networked powersockets? |
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A normal logic port and a transistor and then relay that controls power to the sockets of the network-devices :) |
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>> There is no easy way to enter the room without wipeing the encryption keys. |
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>> Booting up the server requires that a boot disk is brought to the computer |
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>> to decrypt the boot drive. Grub2 can do this easily. This is to prevent |
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>> some one to tamper eith a boot loader. |
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>> |
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>> System is not protected against hardware tamperment. The server room is an |
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>> RF-cage. |
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>> |
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>> I consoder this setup quite secure. |
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> |
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> Makes me wonder what it is you are protecting your server from. :) |
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Well just a hobby. I wanted to play with electronics. The server controls my heating, locks of the house, lights, airconditioning, fire-alarm and burglar-alarm. Gentoo-powered house... |
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-- |
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-Matti |
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