[ISN] Vista encryption 'no threat' to computer forensics

From: InfoSec News (alerts@private)
Date: Sun Feb 04 2007 - 22:32:19 PST


By John Leyden
2nd February 2007

Security advances in Windows Vista are unlikely to frustrate cybercrime 
investigation, according to a leading computer forensics firm.

Enterprise and Ultimate editions of Vista include a feature that 
provides data volume encryption called BitLocker Drive Encryption. 
Suggestions that BitLocker contains a backdoor allowing law enforcement 
agencies automatic access to encrypted volumes have been robustly denied 
by Microsoft.

But that doesn't necessarily mean the availability of Vista will mean 
the widespread adoption of disc encryption technologies that will 
frustrate law enforcement investigations in computer crime, including 
trafficking in images of child abuse, computer hacking, industrial 
espionage and other offences.

For one thing, in two of its three modes of operation BitLocker requires 
a cryptographic hardware chip called a Trusted Platform Module and a 
compatible BIOS. These chips are yet to become widely available much 
less deployed. The third mode requires a user to insert a USB device 
that contains a startup key in order to boot the protected OS.

That means law enforcement officers need to get into the habit of 
seizing USB keys as well as PCs in the course of conducting a raid. 
Brian Karney, director of product marketing at Guidance Software, said 
the computer forensics firm had worked with Microsoft on BitLocker and 
that it knew of "no backdoors".

Getting to machines while they are still turned on and taking a 
forensically sound copy is an option even in the absence of USB Keys, 
Karney explained. "Even though the logical volume is encrypted the OS 
works on top of an abstraction layer. We can see what the OS sees so 
that it's possible to acquire data on a running Vista machine even when 
it is running BitLocker."

In cases when a consumer machine running Vista happens to be turned off 
at the point its seized, a password is needed. However, in corporate 
environments a BitLocker recovery key can be used to allow examination 
of target devices.

In some ways, the issue boils down to who is more knowledgeable about 
the use of encryption or other security technologies: investigators or 
the targets of investigation, an issue far from restricted to use of 
encryption technology in Windows Vista.

"We're seeing the same concerns with Vista as we saw with XP over the 
idea that built-in encryption features might frustrate law enforcement 
efforts. In practice XP has not proved to be a problem for computer 
forensics and we don't think Vista will be either," said Bill Thompson, 
director of professional development and training at Guidance Software. 
"Sometimes people use file wiping utilities or other tools but often 
they are not configured properly. People accept the default settings, 
which can leave fragments of data."

Guidance Software's EnCase computer forensic software is widely used by 
law enforcement agencies worldwide and is increasingly been used by 
private sector firms to investigate employee wrongdoing. One of 
Guidance's customers is the Metropolitan Police, which is using the 
technology to recover deleted emails as part of its cash for honours 

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