Disk encryption not safe enough

[orca3000]

http://blog.wired.com/27bstroke6/2008/0 ... s-dis.html

According to a new study from Princton, it is vulnerable to "cold boot attacks" because the RAM retains information for minutes after power off when they are cooled (see the CO2 canister in the picture), thus alowing the encryption information to be retrieved if the attacker have the computer in phusical possesion.