Well you could set a library on fire
My laptop gets hot enough to do that anyway, so its not an increased risk.
When the FBI try to steal my Bitcoins, signing all the dust transactions in my wallet will cause the laptop to heat up, detonating the thermite.
Probably not true (your laptop getting hot enough). If your laptop did get hot enough to burn down the library then it would likely melt.
Although the burning point of a HDD is lower then that of paper/wood it would be difficult to have a controlled enough burn so that your computer melts (which is essentially what will need to happen to sufficiently protect yourself) but the table/books around you do not catch fire.
Not only that but his work on the site likely would require him to remain concentrated for times of greater then one minute.
One potential similar solution would be for him to be required to enter his password ever
n minutes (with
n[/n] being a small number) or else the hard drive shuts down (which obviously has full disk encryption) and power is cutoff from the RAM)
I thought it was obvious we were using satire.
And yes you are right, that is a good solution, though the problem is it's not convenient, your security solutions need to be very convenient or else you're likely to turn them off. Something like that is going to slow down your work speed as you'll be constantly interrupted to enter a password, and everytime you enter the password you risk exposing it to any audio/video recording device or a shoulder surfer. On top of that someone only needs access to your powered on computer for a few seconds to defeat FDE, though LE have a standard procedure they must go through to keep everything forensically sound and that takes much longer than a few seconds.
Law enforcement cyberforensics are known to use mouse jigglers like this:
http://www.cru-inc.com/products/wiebetech/hotplug_field_kit/These are a USB device that simulates a moving mouse to prevent the laptop from locking/shutting down when conducting forensics. What is great about these is that many of them use USB vendor ID's that software can easily detect
Also, many laptops such as macbooks have a built in g-sensor, so if the laptop is suddenly moved or pulled away from you, it can easily be programmed to lock the screen or shutdown.
And what about voice commands, should something go wrong you could setup a voice command where you shout out a secret word and the laptop shuts down.
Another thing you can do is solder your RAM to the motherboard. Unless the forensics can get root on your machine or your motherboard has some way of DMA (such as firewire) that you didn't disable they will need to bring it to a lab to dump the RAM. This will take a couple of hours at least I'd say, so your solution would be very useful here.
And speaking of prying apart laptops, many laptops have sensors that can detect when the case has been opened.
The list of things he could've done goes on, but hindsight is always 20/20.
You think an attacker would only need access to your computer for a few seconds to copy an entire unencrypted hard drive?
If the encryption software were programmed to automatically encrypt the entire hard drive after
n minutes with the absence of a password, then someone in the process of copying the hard drive would not be able to continue doing so after
n minutes.
The software prompting a password would be based on time, not computer activity. The timer would be housed on some separate hardware that could not be controlled/manipulated without physically opening (and powering off) the computer. Instead of a password, it could be a very simply encryption system, something that can easily be "decrypted" by a person, for example the computer could display the word "bitcoin" and someone would need to input the numbers "2472646" (the telephone numbers that commonly have such letters engraved into them) - or maybe something slightly more complex.
Other solutions would be to have some kind of USB stick/drive that would serve as a kill switch in the event that it is unplugged, such USB drive would be tethered to either his wrist or neck so if the laptop is pulled away from him then it would be unplugged and the computer would shut down.