Feeds

Researchers show up deniable file system crypto leaks

Deny deny denied

Beginner's guide to SSL certificates

Crytography researchers have demonstrated weaknesses in encryption technology used to create so-called deniable file systems (DFS).

On-the-fly cryptography packages such as TruCrypt allow the creation of a hidden, encrypted volume (containing files and directories) on a hard disk. Users typically create Alice, a standard encrypted file system on a laptop, protected by a password. A second (deniable) file system can be created inside this encrypted volume, with access controlled by a second password.

However, Windows Vista Microsoft Word and Google Desktop all compromise the deniability of a TrueCrypt DFS steganography, according to a team including crypto guru Bruce Schneier and researchers from the University of Washington.

The problem is that applications such as Word or Google Desktop leak information outside of the deniable volume - for example, in lists of recently changed documents or snapshots captured by Google Desktop, providing the "enhanced search" option is enabled. Potentially worse still, Word auto-saves the contents of encrypted files as plain text to open portions of a hard disk. Although the research was carried out using TrueCrypt version 5.1a, the issue could apply to other non-full disk encryption software.

"Our results suggest any DFS will not only have to encrypt and hide data — as file systems like TrueCrypt do — but must also erase any traces of that data left by the operating system through normal operation," the researchers conclude.

The DFS approach is gaining increased attention as a means to hide sensitive information from laptop border searches, prompting the interest of the researchers, who suggest approaches for improving the technology. Even if these suggested changes are made, crypto boffins caution against blind trust in the effectiveness of such systems.

TrueCrypt version 6, released at the start of July, introduces new features such as the ability to create deniable operating systems which were beyond the scope of study.

Schneier, CTO of BT Counterpane, told Dark Reading that although this version will "definitely close some of the leakages, but it's unlikely that it closed all of them".

The team's research paper, Defeating Encrypted and Deniable File Systems: TrueCrypt v5.1a and the Case of the Tattling OS and Applications, is due to be presented at the USENIX Workshop on Hot Topics in Security (HotSec 2008) conference in San Jose at end of this month. ®

Internet Security Threat Report 2014

More from The Register

next story
Webcam hacker pervs in MASS HOME INVASION
You thought you were all alone? Nope – change your password, says ICO
You really need to do some tech support for Aunty Agnes
Free anti-virus software, expires, stops updating and p0wns the world
Meet OneRNG: a fully-open entropy generator for a paranoid age
Kiwis to seek random investors for crowd-funded randomiser
USB coding anarchy: Consider all sticks licked
Thumb drive design ruled by almighty buck
Attack reveals 81 percent of Tor users but admins call for calm
Cisco Netflow a handy tool for cheapskate attackers
Privacy bods offer GOV SPY VICTIMS a FREE SPYWARE SNIFFER
Looks for gov malware that evades most antivirus
Patch NOW! Microsoft slings emergency bug fix at Windows admins
Vulnerability promotes lusers to domain overlords ... oops
prev story

Whitepapers

Choosing cloud Backup services
Demystify how you can address your data protection needs in your small- to medium-sized business and select the best online backup service to meet your needs.
Forging a new future with identity relationship management
Learn about ForgeRock's next generation IRM platform and how it is designed to empower CEOS's and enterprises to engage with consumers.
Reg Reader Research: SaaS based Email and Office Productivity Tools
Read this Reg reader report which provides advice and guidance for SMBs towards the use of SaaS based email and Office productivity tools.
Managing SSL certificates with ease
The lack of operational efficiencies and compliance pitfalls associated with poor SSL certificate management, and how the right SSL certificate management tool can help.
Intelligent flash storage arrays
Tegile Intelligent Storage Arrays with IntelliFlash helps IT boost storage utilization and effciency while delivering unmatched storage savings and performance.