ComputerUser.com

Full Disk Encryption Isn't Quite Dead Los Angeles CA

Manipulating cold memory chips isn't for the faint at heart. Over the past two years, other researchers realized they could capture memory on powered-up computers by using the 1394 FireWire port found on most higher-end laptops.
E Ram Network Inc
(213) 385-5567
901 S Berendo Street
Los Angeles, CA
Avacast
(323) 939-9568
4311 Wilshire Boulevard
Los Angeles, CA
Deltel Inc
(213) 688-7545
600 W 7th Street
Los Angeles, CA
Computec Service Center Corp.
(213) 736-5250
3600 Wilshire Boulevard Ste 229
Los Angeles, CA
Calpop.Com Inc
(213) 627-1937
600 W 7th Street
Los Angeles, CA
AM6 Networks Inc
(213) 927-9200
3325 Wilshire Boulevard
Los Angeles, CA
Moeim Inc
(213) 480-9000
3345 Wilshire Boulevard
Los Angeles, CA
Voice Broadcasting
(213) 622-8756
624 S Grand Avenue
Los Angeles, CA
GEEK PATROL we send a SQUAD of geeks to you repair network computer internet WE ARE THE BEST BUY
(213) 341-8346
Los Angeles, CA
Netcontrol.Org
(213) 413-0046
1930 Wilshire Boulevard # 1003
Los Angeles, CA
Data Provided by:
 
Provided By:

Full Disk Encryption Isn't Quite Dead

At least once a month, it seems some vendor or techie claims to have broken a version of a hard drive full-disk encryption (FDE) program scheme, whether it's from Microsoft (my full-time employer), BitLocker, open source favorite TrueCrypt, or some other variant. All the stories and the hype are enough to make one wonder if FDE is dead.

The brief -- and slightly qualified -- answer is no. There are a handful of clever attacks, as well as software to make them easier to pull off. Luckily there are easy ways to prevent most of them. We will start, however, with an attack that doesn't have an easy defense.

[ A malicious Facebook ad is redirecting users to fake antivirus software. | Learn how to secure your systems with Roger Grimes' Security Adviser blog and Security Central newsletter, both from InfoWorld. ]

Cold boot attack
In February 2008, a team including Princeton's Dr. Edward Felton -- one of the world's premier computer security researchers -- used an interesting intrinsic property of computer memory to successfully hack BitLocker [PDF]. It turns out that computer memory chips will hold their contents from a few seconds to a few minutes after the computer's power is turned off. Further, lowering the temperature or freezing the chips enables the contents to remain in play much longer -- enough time to be transferred to another specialized analysis computer so that the data can be copied to permanent storage. The attack team could then search for the primary BitLocker encryption key and unlock the data.

Browser Security Deep Dive

The "cold boot" attack is perhaps the toughest attack to defend against on a computer without specialized crypto-hardware. The flaw lies more with computer memory than the involved crypto. All software-based crypto has to eventually place the decryption key in normal memory in an unprotected state so that it can be used to decrypt the hard drive. An attacker can always find the unprotected key when he or she has a copy of memory to examine.

This plan requires the attacker to somehow acquire the victim's computer while it's powering down, just after it's powered down, or when it's coming back up from a suspended or standby state. Then the attacker has to freeze the chips, transfer them to another specialized computer, and use specially built software to find the key for the FDE cipher. If you're worried about this attack, make sure your unattended, powered-on computers have good physical security; alternatively, consider using hardware crypto solutions that are resistant to cold boot attacks.

Manipulating cold memory chips isn't for the faint at heart. Over the past two years, other researchers realized they could capture memory on powered-up computers by using the 1394 FireWire port found on most higher-end laptops. Here's one discussion detailing how to crack BitLocker using the FireWire memory attack [PDF].

Exploitation via FireWire
Prolific crypto- an...
Full disk encryption isn't quite dead

Click here to read the rest of this article from Computer User